E.5

Question 1

what is an Igneous rock

Answer 1

Rock formed from cooled magma (from the mantle).

Question 2

what is intrusive igneous

Answer 2

Cools below Earth’s surface.
Ex) granite

Question 3

what is extrusive igneous

Answer 3

Cool’s above Earth’s surface (cooled lava).
Ex) obsidian

Question 4

How do intrusive and extrusive rocks look different?

Answer 4

Extrusive rocks have finer (smaller) grains because they cooled quicker and had less time for crystals to grow.

Question 5

what is an sedimentary rock

Answer 5

Formed by settling of sediments that are compacted into rock.
Ex) sandstone, limestone

Question 6

What are sediments and how do they pile up?

Answer 6

Sediments are small pieces of rocks eroded off by wind or water and deposited elsewhere.

Question 7

what is strata

Answer 7

Layers of sedimentary rock.

Question 8

what is a metamorphic rock

Answer 8

Rock that has changed form because of great heat and pressure.
Ex) gneiss, marble

Question 9

How can we tell how long a rock has been under great pressure and heat?

Answer 9

The longer a rock has had under pressure and heat the larger the grains.