lesson 13/14: igneous rocks

Question 1

igneous

Answer 1

These rocks are formed when magma (underground lava) cools and solidifies. Sometimes, the cooling is slow as the magma approaches the Earth’s surface. Some of that red-hot magma breaks through the Earth’s crust to form fiery volcanoes releasing lava to cool quickly on the surface or even underwater.

Question 2

sedimentary

Answer 2

These rocks are formed when erosion and deposition create layers of sediments; this can include the remains of living things that are hardened by compaction as more and more layers of sediment are added.

Question 3

metamorphic

Answer 3

These rocks are formed when rocks change at great depths below the ground where temperatures are very high (greater than 200 °C) and there is high pressure. Both the mineral type and appearance can change. The change happens in the solid state; meaning there is no melting.