Unit test 2 Grade 9 GEO

Question 1

4 Major Components of the Earths Structure?

Answer 1

Crust, Mantle, Outer Core, Inner Core

Question 1

Density of the Earth

Answer 1

Increases the closer to Earths center you go

Question 2

Why is the Core of the Earth hot and dense?

Answer 2

Radioactive Elements

Question 3

What does the core contain

Answer 3

Metals ( silicates )

Question 4

Is the inner core liquid or solid?

Answer 4

Even thought it’s hot, the core is still a solid due to pressure

Question 5

What does the outer core contain?

Answer 5

Convection Cells

Question 6

Why do Earth have a magnetic field

Answer 6

Turning if metals

Question 7

Do Convection cells move?

Answer 7

It circulate through upper and lower mantle

Question 8

Is the Mantle solid or liquid

Answer 8

The mantle is mostly solid

Question 9

how thick is the Mantle

Answer 9

Approximately 2900km thick

Question 10

How much does the Mantle account for Earths Volume

Answer 10

84%

Question 11

What are silicates

Answer 11

Compounds that share silicon and oxygen

Question 12

How hot is the Mantle

Answer 12

1000C to 3700C

Question 13

Eras

Answer 13

PPMC: Precambrian, Paleozoic, Mesozoic, Cenozoic

Question 14

When did the Earth Begin?

Answer 14

4.6 billion years ago

Question 15

When did each of the eras start

Answer 15

4.6bya, 540mya, 248mya, 66mya