Pre-Assessment: Igneous Rocks: How Are They Formed?

What classification of rocks is formed from solidification and crystallization of molten rocks?

• igneous rocks

• metamorphic rocks

• sedimentary rocks

• all of the above

The term "igneous" is derived from what Latin word?

• ignus

• lithos

• meta

• sedere

Which of the following is/are the process/es of igneous rocks?

• sedimentation

• recrystallization

• solidification and crystallization

• solidification and recrystallization

Which type of igneous rocks based on composition has the highest amount of silica content?

• felsic

• intermediate

• mafic

• ultramafic

What happens to the molten rocks when they reach the Earth's Surface?

• They flow continuously.

• They cool down and solidify.

• Their temperature remains the same.

• They remain semi-liquid molten rocks.

Which of the following is NOT an extrusive igneous rock?

• basalt

• granite

• obsidian

• rhyolite

Which type of igneous rock forms from lava on Earth's surface?

• clastic

• extrusive

• intrusive

• non-clastic

Which type of igneous rock forms when magma hardens beneath Earth's surface?

• clastic

• extrusive

• intrusive

• non-clastic

What is the size of the crystals if the rock cools slowly and forms below the Earth's surface?

• large

• no crystals

• small

• non of the above

Which of the following is OT an intrusive igneous rock?

• diorite

• gabbro

• granite

• obsidian