Lesson 3 Igneous Rocks

If you wanted to try to find diamonds, what type of rock might you look for?

• lava

• magma

• volcanic rock

• diamonds

What type of rocks form from magma or lava?

• Sedimentary rocks

• Igneous rocks

• Organic rocks

• Metamorphic rocks

What type of igneous rock is formed from LAVA that ERUPTED onto Earth's surface?

• Sedimentary rock

• Intrusive rock

• Organic rock

• Extrusive rock

What type of igneous rock is formed when MAGMA hardened BENEATH the surface of Earth?

• Intrusive rock

• Organic rock

• Sedimentary rock

• Metamorphic rock

Slowly cooling magma forms coarse-grained rocks, with large crystals.

• True

• False

• I don't know

What type of grains form in igneous rocks when lava cools rapidly?

• Fine grains with small crystals or no crystals at all.

• Large and coarse grains.

• Only large and strong crystals.

• I don't know

The content of silica varies in magma and lava. Which one has LOW silica content?

• Lava

• Magma

• I don't know

What material has HIGH silica content?

• I don't know

• Magma

• Lava

What type of rock is hard, dense and durable, and has been used for tools and building materials?

• Organic rock

• Sedimentary rock

• Igneous rock

• Metamorphic rock

Which are examples of igneous rocks?

• Quartz, Feldspar, Mica.

• Gypsum, Silver, Gold.

• Limestone, Sandstone, Coal.

• Pumice, Obsidian, Granite