Rock Cycle - Igneous

Question 1

As rock cools further…

Answer 1

Crystals form

Question 2

Contain?

Answer 2

Valuable minerals, eg. Silver, gold, diamonds, copper

Question 3

Extrusive

Answer 3

• forms when lava cools quickly on earths surface
• lava exits volcano
• minerals do not get a chance to form, little or no crystals
• dark colors=basalt and obsidian
• light colors=rhyolite
• fine grain crystals

Question 4

Intrusive

Answer 4

• magma cools slowly over millions of years beneath the surface
• magma inside volcano cools slowly
• large interlocking crystals
• dark colors=gabbro
• large grain crystals

Question 5

Used as…? Why?

Answer 5

Building materials, hard and highly resistant to weathering. Can be extracted in large blocks, uniform in composition and texture. Appear similar in facade. Eg. Voortrekker monument and London Tower Bridge

Question 6

Forms from?

Answer 6

Molten rock cooling and solidifying, either within earths crust or on surface