earth-science Vocabulary
JamWise Education Team·Updated March 2026
The earth-science strand is a core part of the K-8 science curriculum. It encompasses 111 vocabulary terms that students encounter as they progress from kindergarten through 8th grade. Each term builds on previous knowledge, creating a spiral of deepening understanding that prepares learners for increasingly complex concepts.
Understanding earth-science vocabulary is essential for classroom discussions, assessments, and real-world application. Below you will find every term organized by grade level, so teachers and parents can quickly identify which words are appropriate for their students and explore definitions tailored to each developmental stage.
Kindergarten
(11 terms)
Cloud
A cloud is a white or gray fluffy shape in the sky made of tiny water drops.
Day
Day is the time when your part of Earth faces the sun and the sky is bright.
Night
Night is the time when your part of Earth faces away from the sun and the sky is dark.
Rain
Rain is water that falls from clouds to the ground.
Season
A season is a time of year. The four seasons are spring, summer, fall, and winter.
Shade
Shade is a dark area where sunlight is blocked by something.
Snow
Snow is tiny white ice crystals that fall from clouds when it is very cold.
Sun
The sun is a star that gives Earth light and warmth.
Temperature
Temperature tells how hot or cold something is.
Weather
Weather is what the air outside is like — sunny, rainy, windy, or snowy.
Wind
Wind is moving air. You can feel wind on your face but you cannot see it.
1st Grade
(15 terms)
Desert
A desert is a dry place that gets very little rain. Deserts can be hot or cold.
Forest
A forest is a large area of land covered with many trees.
Lake
A lake is a large body of water surrounded by land on all sides.
Moon
The moon is a large round object in the sky that shines at night using light from the sun.
Ocean
An ocean is a huge body of salt water that covers most of Earth.
Pond
A pond is a small, still body of fresh water where many plants and animals live.
River
A river is a large stream of water that flows across the land toward an ocean or lake.
Rock
A rock is a hard, solid piece of earth. Rocks come in many shapes, sizes, and colors.
Season
A season is one of four times of the year — spring, summer, fall, and winter — each with different weather.
Soil
Soil is the dirt on the ground where plants grow. It is made of tiny bits of rock and dead plants.
Star
A star is a ball of hot, glowing gas far away in space. The sun is our closest star.
Sunrise
Sunrise is when the sun comes up in the morning and the sky gets bright.
Sunset
Sunset is when the sun goes down in the evening and the sky turns colorful.
Water
Water is a clear liquid that all living things need. It fills oceans, rivers, and lakes.
Weather tools
Weather tools help us measure weather, like a thermometer for temperature, a rain gauge for rain, and a wind sock for wind direction.
2nd Grade
(14 terms)
Continent
A continent is a very large area of land. Earth has seven continents.
Erosion
Erosion is when wind or water slowly wears away and moves rock and soil.
Glacier
A glacier is a huge, thick sheet of ice that moves very slowly across the land.
Island
An island is a piece of land completely surrounded by water.
Landform
A landform is a natural shape on Earth's surface, like a mountain, valley, or hill.
Map
A map is a drawing that shows what a place looks like from above.
Mountain
A mountain is a very tall landform that rises high above the land around it.
Natural resource
A natural resource is something found in nature that people use, like water, trees, and minerals.
Ocean
An ocean is a huge body of salt water. Oceans cover most of Earth's surface.
Soil
Soil is the top layer of Earth made from tiny pieces of rock, dead plants, and animals. Plants grow in soil.
Stream
A stream is a small, narrow body of moving water that flows over rocks and through fields.
Valley
A valley is a low area of land between two hills or mountains.
Volcano
A volcano is a mountain with an opening where hot melted rock and ash can come out of the earth.
Weathering
Weathering is the slow breaking apart of rocks by wind, water, ice, or plant roots.
3rd Grade
(10 terms)
Climate
Climate is the usual pattern of weather in a place over a long time.
Condensation
Condensation is when water vapor cools down and turns back into tiny drops of liquid water.
Evaporation
Evaporation is when water gets warm and changes from a liquid into an invisible gas called water vapor.
Natural hazard
A natural hazard is a dangerous event in nature, like a flood, tornado, or earthquake.
Precipitation
Precipitation is water that falls from clouds to the ground as rain, snow, sleet, or hail.
Soil layers
Soil has layers — dark topsoil on top where plants grow, lighter subsoil in the middle, and broken rock at the bottom.
Thermometer
A thermometer is a tool that measures temperature — how hot or cold something is.
Water cycle
The water cycle is the way water moves from Earth to the sky and back again through evaporation, condensation, and precipitation.
Weather pattern
A weather pattern is a type of weather that repeats or stays the same for a while in a place.
Wind vane
A wind vane is a tool that shows which direction the wind is blowing from.
4th Grade
(18 terms)
Compass
A compass is a tool with a magnetic needle that always points north, helping you find direction.
Conservation
Conservation is the careful use and protection of natural resources so they last for the future.
Deposition
Deposition is when wind or water drops off sand, soil, or rocks in a new place.
Earthquake
An earthquake is a sudden shaking of the ground caused by movement of rocks deep inside Earth.
Erosion
Erosion is the process of wind, water, or ice wearing away rock and soil and carrying it to a new place.
Fossil
A fossil is the preserved remains, imprint, or trace of a living thing from long ago, found in rock.
Fossil record
The fossil record is all the fossils scientists have found that tell the story of life on Earth over millions of years.
Igneous rock
Igneous rock forms when hot melted rock cools and hardens. Granite and basalt are igneous rocks.
Metamorphic rock
Metamorphic rock forms when existing rock is changed by extreme heat and pressure deep underground.
Nonrenewable energy
Nonrenewable energy comes from sources that can be used up and take millions of years to form, like coal and oil.
Nonrenewable resource
A nonrenewable resource is a natural resource that takes millions of years to form and can run out, like coal, oil, and natural gas.
Renewable energy
Renewable energy comes from sources that will not run out, like sunlight, wind, and water.
Renewable resource
A renewable resource is a natural resource that can be replaced naturally over time, like trees, wind, and sunlight.
Sedimentary rock
Sedimentary rock forms when layers of small pieces of rock, sand, or mud are pressed together over millions of years.
Solar energy
Solar energy is energy from the sun that can be used as heat or converted into electricity.
Topographic map
A topographic map uses lines to show the shape and height of the land, including mountains, valleys, and hills.
Volcano
A volcano is an opening in Earth's surface where hot melted rock called lava erupts.
Weathering
Weathering is the process of breaking rocks into smaller pieces by wind, water, ice, or living things.
5th Grade
(25 terms)
Air mass
An air mass is a large body of air that has about the same temperature and moisture throughout.
Air pressure
Air pressure is the weight of the atmosphere pushing down on Earth's surface.
Anemometer
An anemometer is a tool with spinning cups that measures wind speed.
Atmosphere
The atmosphere is the layer of gases surrounding Earth that contains the air we breathe.
Barometer
A barometer is a tool that measures air pressure, which helps predict weather changes.
Biosphere
The biosphere is the part of Earth where life exists — from deep ocean floors to high mountain peaks.
Climate
Climate is the average weather conditions in a region over a long period of time, usually 30 years or more.
Condensation
Condensation is when water vapor cools and changes back into tiny liquid water drops, forming clouds or dew.
Constellation
A constellation is a group of stars that form a pattern or picture in the night sky.
Deposition
Deposition is when eroded material is dropped in a new location when the wind or water carrying it slows down.
Erosion
Erosion is the movement of weathered rock, soil, and sediment from one place to another by water, wind, ice, or gravity.
Evaporation
Evaporation is when liquid water is heated and changes into water vapor, an invisible gas that rises into the air.
Front
A front is the boundary where two different air masses meet, often causing changes in weather.
Geosphere
The geosphere is all the rock, soil, and minerals that make up the solid part of Earth.
Hydrosphere
The hydrosphere is all the water on Earth — in oceans, lakes, rivers, glaciers, and underground.
Nitrogen
Nitrogen is a gas that makes up about 78% of Earth's atmosphere and is essential for plant growth.
Orbit
An orbit is the curved path an object takes as it travels around another object in space due to gravity.
Oxygen
Oxygen is a gas in the air that animals breathe in and plants release during photosynthesis.
Revolution
Revolution is when one object travels all the way around another object. Earth's revolution around the sun takes one year.
Rotation
Rotation is when an object spins around its own axis. Earth rotates once every 24 hours, causing day and night.
Runoff
Runoff is water from rain or melting snow that flows over the ground into streams, rivers, and lakes.
Telescope
A telescope is a tool that makes distant objects like stars and planets appear closer and larger.
Transpiration
Transpiration is when water moves through a plant and evaporates from its leaves into the air.
Water cycle
The water cycle is the continuous movement of water from Earth's surface to the atmosphere and back again through evaporation, condensation, and precipitation.
Weather map
A weather map shows weather conditions over a large area using symbols for temperature, pressure, and fronts.
6th Grade
(12 terms)
Asthenosphere
The asthenosphere is the partially melted, flowing layer of Earth's mantle beneath the lithosphere that allows tectonic plates to move.
Gravity
Gravity is the force of attraction between two objects due to their mass — the larger the mass, the greater the force.
Igneous rock
Igneous rock forms when hot melted rock called magma or lava cools and hardens.
Lithosphere
The lithosphere is the rigid outermost layer of Earth, made up of the crust and upper mantle, broken into tectonic plates.
Metamorphic rock
Metamorphic rock forms when existing rock is transformed by intense heat and pressure deep inside Earth.
Mineral
A mineral is a naturally occurring, inorganic solid with a specific chemical composition and a crystalline structure.
Plate boundary
A plate boundary is the edge where two tectonic plates meet, where earthquakes and volcanoes often occur.
Plate tectonics
Plate tectonics is the theory that Earth's outer layer is made of large moving plates that float on the hot mantle below.
Rock cycle
The rock cycle is the continuous process by which rocks are created, changed, broken down, and reformed into different types.
Sedimentary rock
Sedimentary rock forms when layers of sand, mud, or other materials are pressed and cemented together over time.
Solar system
The solar system is the sun and all the objects that orbit it, including eight planets, moons, asteroids, and comets.
Weathering
Weathering is the process by which rocks are broken down by physical forces or chemical reactions at Earth's surface.
7th Grade
(15 terms)
Absolute age
Absolute age is the actual age of a rock or fossil in years, determined through radioactive dating methods.
Chemical weathering
Chemical weathering is the breakdown of rock through chemical reactions that change the minerals in the rock.
Continental drift
Continental drift is the theory that continents have slowly moved over Earth's surface throughout geologic history.
Convection current
A convection current is a circular flow of material caused by heating — hot material rises and cool material sinks.
Earthquake
An earthquake is a sudden release of energy in Earth's crust caused by the movement of tectonic plates along faults.
Erosion
Erosion is the process by which weathered rock and soil are transported from one location to another by water, wind, ice, or gravity.
Fault
A fault is a crack in Earth's crust where blocks of rock have moved past each other.
Mechanical weathering
Mechanical weathering is the physical breakdown of rock into smaller pieces without changing its chemical composition.
Mineral
A mineral is a naturally occurring, inorganic solid with a definite chemical composition and crystal structure.
Relative age
Relative age tells whether a rock layer or fossil is older or younger than another, without giving an exact number of years.
Rock cycle
The rock cycle is the continuous process by which rocks transform between igneous, sedimentary, and metamorphic types through melting, weathering, heat, and pressure.
Seismic wave
A seismic wave is a wave of energy that travels through Earth, usually caused by an earthquake.
Tectonic plate
A tectonic plate is a massive slab of Earth's lithosphere that moves slowly over the asthenosphere.
Topography
Topography is the shape and features of Earth's surface, including mountains, valleys, plains, and rivers.
Volcano
A volcano is an opening in Earth's crust where magma, ash, and gases escape from deep inside the planet.
8th Grade
(15 terms)
Carbon cycle
The carbon cycle is the movement of carbon through Earth's atmosphere, oceans, soil, and living things.
Climate change
Climate change is a long-term shift in global temperatures and weather patterns, currently accelerated by human activities releasing greenhouse gases.
Geologic time scale
The geologic time scale is the system scientists use to organize Earth's 4.6-billion-year history into eons, eras, periods, and epochs.
Greenhouse effect
The greenhouse effect is the process where certain gases in Earth's atmosphere trap heat from the sun, keeping the planet warm.
Half-life
Half-life is the time it takes for half of the atoms in a radioactive substance to decay.
Nitrogen cycle
The nitrogen cycle is the process by which nitrogen moves through the atmosphere, soil, and living organisms.
Nonrenewable energy
Nonrenewable energy comes from finite sources that take millions of years to form, such as coal, petroleum, and natural gas.
Plate tectonics
Plate tectonics is the scientific theory explaining how Earth's lithosphere is divided into plates that move, causing earthquakes, volcanoes, and mountain building.
Renewable energy
Renewable energy comes from sources that are naturally replenished, such as solar, wind, hydroelectric, and geothermal power.
Sea-floor spreading
Sea-floor spreading is the process where new oceanic crust forms at mid-ocean ridges as magma rises and pushes plates apart.
Subduction
Subduction is the process where one tectonic plate slides beneath another, often forming deep ocean trenches and volcanic arcs.
Superposition
The law of superposition states that in undisturbed rock layers, the oldest layers are at the bottom and the youngest are at the top.
Tides
Tides are the regular rise and fall of ocean water levels caused mainly by the gravitational pull of the moon.
Troposphere
The troposphere is the lowest layer of Earth's atmosphere where all weather occurs and where we live.
Water table
The water table is the underground level below which the soil and rock are completely saturated with water.