Rocks & Minerals — Set 2

Which is the hardest natural mineral on the Mohs scale?

What is the most abundant group of minerals in the Earth's crust?

What is the chemical composition of the mineral Quartz?

Which igneous rock is known as 'volcanic glass' due to its lack of crystal structure?

Which light-colored volcanic rock is known for being able to float on water?

Which sedimentary rock consists of rounded pebbles cemented together?

What is molten rock called when it is beneath the Earth's surface?

What is the term for molten rock that has erupted onto the Earth's surface?

Which of the following represents a large, deep-seated intrusive igneous body?

What is a vertical intrusion of magma that cuts across rock layers called?