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dissolve


to break down and mix into a liquid

A scientist stirred a powder to dissolve it in water.

dissolve

bedrock


the layer of solid rock beneath the soil

Explorers discovered a cave within China’s bedrock.

  bedrock

geologist


a scientist who studies rocks to learn about the history of Earth

The geologist studied a rock from an ancient volcano.

geologist

erosion


the wearing away of rock by forces like water or wind

The ancient cave was formed as a result of erosion.

erosion

laser


a focused beam of light

Scientists used a laser to measure the size of a cave.

  laser

magma


melted rock found underground

Magma is found below Earth’s crust.

  magma
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