Chapter 8.2

Question 1

What is magma and lava?

Answer 1

Magma is very hot molten rock.When magma reaches the surface it’s called lava

Question 2

How does igneous rocks form?

Answer 2

Igneous rocks form from cooled lava from deep in the earth.

Question 3

What are extrusive igneous rocks?

Answer 3

Extrusive igneous rocks form above ground and have no or small crystals due to the rapid cooling of the lava.

Question 4

What is intrusive igneous rocks?

Answer 4

Intrusive igneous rocks contain larger interlocking crystals. These crystals are a result of magma cooling slowly below ground

Question 5

What are the Characteristics of igneous rocks?

Answer 5

• Interlocking crystals ( you might have to use a microscope to see some of the crystals)
• Hard

Question 6

How to classify and name different igneous rock?

Answer 6

• Is it rough or smooth
• The size of the crystals
• The colour
• If there is any air bubbles

Question 7

What do you use igneous rock for?

Answer 7

Basalt: buildings,concrete, floor tiles
Dolerite: road surfaces, concrete
Granite: Buildings, monuments road surfaces, kitchen bench tops
Pumice: cleaning dead skin off feet, emery boards for sharpening nails, some soaps that feel rough on your skin
Obsidian: scalpel blades for surgery, ornaments and jewellery, spear and arrow points, pots and vases