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crust


the rocky outer layer of Earth

Earth's crust is the planet’s outer surface.

crust

mantle


the thick zone of rock beneath Earth’s crust

Earth’s mantle is made up of hot rock that can flow like a liquid.

  mantle

geologist


a scientist who studies Earth’s history and structure

Geologists study rocks to learn more about Earth’s history and structure.

  geologist

tectonic plate


a section of Earth’s crust that moves slowly over Earth’s inner layers

Tectonic plates fit together like a jigsaw puzzle to form Earth’s outer surface.

  tectonic plate

microbes


living things, such as bacteria, too small to be seen with the naked eye

Microbes are found everywhere, but are too small to be seen.

  microbes
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