Quiz on Igneous Rocks

What are igneous rocks primarily formed from?

• Sediments

• Magma

• Fossils

• Water

Which of the following is an example of an igneous rock?

• Sandstone

• Limestone

• Granite

• Shale

What process leads to the formation of igneous rocks?

• Erosion

• Melting

• Cooling and solidification

• Compaction

Where can you commonly find igneous rocks?

• Deserts

• Riverbeds

• Volcanic areas

• Oceans

What is the main difference between intrusive and extrusive igneous rocks?

• Color

• Texture

• Formation location

• Size

Which igneous rock has a glassy texture and is often black?

• Basalt

• Obsidian

• Granite

• Pumice

What type of igneous rock forms when magma cools slowly beneath the Earth's surface?

• Extrusive

• Intrusive

• Sedimentary

• Metamorphic

What characteristic is common in extrusive igneous rocks?

• Large crystals

• Fine-grained texture

• Layered appearance

• Fossil presence

Which rock is known for floating on water due to its low density?

• Granite

• Basalt

• Pumice

• Diorite

Which mineral is commonly found in igneous rocks and is known for its hardness?

• Talc

• Quartz

• Gypsum

• Halite