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Earth science vocabulary: volcanoes to fossils

This list supports middle school earth science students studying volcanoes, earthquakes, plate tectonics, and fossils. Use it to preview a unit, review key terms before a quiz, or connect vocabulary to real processes happening inside and on the surface of the earth.

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Earth science vocabulary: volcanoes to fossils

Word	Meaning	In a sentence
volcanonoun	A mountain or opening in the earth's surface through which molten rock, ash, and gas can erupt.	The volcano had been dormant for centuries before it suddenly erupted last year.
magmanoun	Hot, molten or semi-molten rock found beneath Earth's surface.	Magma rises through cracks in the crust and can erupt as lava.
lavanoun	Molten rock that flows from a volcano or a fissure in the Earth's surface.	Bright orange lava flowed slowly down the mountainside toward the coastal village.
eruptionnoun	A sudden, often violent release of material, such as lava, gas, or emotion.	The volcanic eruption forced thousands of nearby residents to evacuate their homes.
earthquakenoun	A sudden violent shaking of the ground caused by movement within the earth's crust.	The earthquake shattered windows and cracked walls across the old town.
tectonic platenoun	One of the large, rigid sections of the Earth's crust that move slowly over the layer beneath them.	Earthquakes often occur along the boundary where two tectonic plates grind against each other.
faultnoun	Responsibility for a mistake or wrongdoing, or a flaw or defect in something.	It was clearly his fault that the car ran out of gas on the highway.
seismographnoun	An instrument that detects and records the strength and duration of earthquake vibrations.	The seismograph recorded a sudden spike when the tremor struck the city.
epicenternoun	The point on the earth's surface directly above where an earthquake begins, or the central point of something.	The epicenter of the earthquake was located just off the coast near the fishing village.
fossilnoun	The preserved remains or traces of an ancient plant or animal, typically found in rock.	Paleontologists discovered a dinosaur fossil embedded deep within the cliffside rock.
sedimentnoun	Solid material, such as sand, silt, or mud, that settles at the bottom of a liquid.	A thin layer of sediment had built up at the bottom of the old fish tank.
sedimentary rocknoun	Rock formed when layers of sediment, such as sand, mud, or organic material, are compressed and cemented together over time.	Sandstone and limestone are common types of sedimentary rock found in canyon walls.
igneous rocknoun	Rock formed by the cooling and hardening of molten magma or lava.	Granite is an igneous rock that forms slowly beneath the Earth's surface.
metamorphic rocknoun	Rock that has been transformed from an existing rock type by intense heat and pressure, without fully melting.	Marble is a metamorphic rock formed from limestone under heat and pressure.
rock cyclenoun	The continuous geological process by which rocks change between igneous, sedimentary, and metamorphic forms over time.	The teacher used a diagram to show how the rock cycle turns magma into igneous rock.
erosionnoun	The gradual wearing away of soil, rock, or land by natural forces such as wind, water, or ice.	Years of coastal erosion have caused the cliff to shrink noticeably.
weatheringnoun	The gradual breakdown or wearing away of rock and other materials by wind, water, or temperature change.	Centuries of weathering carved the strange shapes into the desert cliffs.
mineralnoun	A naturally occurring solid substance with a specific chemical composition, found in rocks and soil.	Quartz is a common mineral found in many types of rock.
crustnoun	The hard, outer layer of something, such as bread, pastry, or the earth.	The bread came out of the oven with a golden, crunchy crust.
mantlenoun	The thick layer of hot, dense rock between Earth's crust and core; also a role or responsibility passed to someone.	Molten rock from the mantle can rise and erupt through volcanoes.
corenoun	The central or most essential part of something, around which everything else is built.	Honesty lies at the very core of any lasting and trustworthy friendship.
continental driftnoun	The theory that the Earth's continents have moved slowly over geological time, once forming a single landmass before drifting apart.	Alfred Wegener proposed the theory of continental drift in the early twentieth century.
tremornoun	A slight, involuntary shaking movement, or a small earthquake felt as a brief shudder of the ground.	A faint tremor rattled the dishes but caused no real damage.
magnitudenoun	The great size, extent, or importance of something, especially when it is difficult to measure exactly.	Scientists only later understood the true magnitude of the damage caused by the earthquake.
craternoun	A large bowl-shaped depression in the ground, often caused by a volcanic eruption, explosion, or impact.	The meteorite left a massive crater in the desert thousands of years ago.
ashnoun	The gray or black powdery residue that remains after something has burned.	Thick ash from the wildfire settled over cars parked several miles away.
lava flownoun	A stream of molten rock that flows from an erupting volcano across the land surface.	The lava flow slowly advanced toward the village, forcing residents to evacuate.
soilnoun	The loose top layer of earth in which plants grow, made of minerals, organic matter, and living organisms.	The farmer tested the soil to see which nutrients it lacked before planting.
humusnoun	The dark, nutrient-rich organic matter in soil formed from decomposed plant and animal material.	Gardeners mix compost into the beds to increase the humus content of the soil.
bedrocknoun	The solid rock lying beneath the soil, sand, or other loose surface material of the Earth.	Engineers drilled through several feet of soil before reaching solid bedrock.

How volcanoes and earthquakes are related

Both volcanoes and earthquakes are caused by the movement of tectonic plates, the huge slabs of rock that make up the earth's crust. When plates grind against each other along a fault, the built-up pressure can release as a tremor, while pressure beneath the crust can push magma upward until it erupts as lava.

Reading the rock cycle and fossils

The rock cycle describes how rocks change form over time through heat, pressure, and erosion, moving between igneous, sedimentary, and metamorphic rock. Fossils usually form in sedimentary rock, where layers of sediment slowly bury and preserve evidence of ancient plants and animals.

Frequently asked questions

What is plate tectonics vocabulary?

Plate tectonics vocabulary includes words like tectonic plate, fault, earthquake, and continental drift, which describe how the earth's crust moves and shifts over time.

How do fossils form?

Fossils typically form when sediment buries plant or animal remains, and over long periods of time that sediment compresses into sedimentary rock, preserving an imprint or trace of the organism.