Igneous and Sedimentary rocks

Where are Intrusive igneous rocks formed?

• Deep within the earth

• On the surface of the earth

Why do extrusive igneous rocks have smaller mineral grains?

• Rapid cooling = more time to form

• Slow cooling = more time to form

• Rapid cooling = less time to form

• Slow cooling = less time to form

SUPPOSE you try to recreate the different rates of cooling using the Tawas (Potassium Aluminium Sulphate) experiment, wherein you dissolve Tawas powder in hot water, pour the solution into 2 different containers, one left in room temperature and one left inside the refrigerator.

Which location would show "slow cooling"?

• Room temperature

• Inside the refrigerator

FOLLOWING the Tawas experiment situation, which location would form smaller Tawas crystals?

• Room temperature

• Inside the refrigerator

Tuff, an extrusive igneous rock, is made up of compacted volcanic debris. What igneous texture does it have?

Obsidian, formed by the extreme difference in temperature of Lava and Water making contact, exhibits what igneous texture?

Aphanitic texture is formed when there is rapid cooling of lava on the surface of the earth. What is another term for this texture?

Phaneritic rocks are formed through ______ cooling of magma underneath the surface of the earth.

Granite is a rock with a course grained texture and a felsic composition. Which of the following is TRUE about granite?

• It is formed by the rapid cooling of lava

• It is cooled from molten rock with less than 20% dark silicates

• It is formed above the surface of the earth

• It has an abundance of dark silicates

You observe a sample to not be made of minerals but rather, of volcanic glass. What is the place of formation for this sample?

• deep within the magma chamber

• along the slope of the volcano

• at the base of a volcano in contact with a lake

• first cooled within the volcano but finished cooling outside it