Topic 2: Unit-1

Question 1

The 4 concentric layers of the earth?

Answer 1

• Crust
• Mantle
• Outer Core
• Inner Core

Question 2

4 Points for Crust layer

Answer 2

1. Outermost layer of the earth
2. Thin shell of solid rock (5-50km thick)
3. Consists of tectonic plates
4. Exposed surface is weathered to form soil

Question 3

5 Points for Mantle layer

Answer 3

1. Layer under crust
2. Thickest layer (2900 km thick)
3. Lower mantle - very hot with magma; can flow slowly and form lava when it comes to the surface (volcanic eruption)
4. Upper mantle - cooler with solid rock
5. upper mantle is in contact with crust which forms part of lithosphere

Question 4

3 Points for Outer Core layer

Answer 4

1. liquid layer of earth surrounding Inner Core
2. 2250 km thick
3. molten metallic rock made of nickel & iron

Question 5

Structure of the Lithosphere

Answer 5

5-70km thick with 2 layers
* Crust - thin layer of rock including soil
- soil formed from weathering of the crust
- composition: rocky particles mixed with organic and inorganic materials
* Upper Solid Mantle

Question 5

Inorganic Materials

Answer 5

Include minerals, water and gases that occur naturally

Question 5

4 Points for Inner Core layer

Answer 5

1. Innermost solid core
2. solid metal (2440 km thick)
3. Very high temperatures & Pressure
4. Consists of iron

Question 6

examples of minerals (valuable resources)

Answer 6

Copper; Diamond; Platinum

Question 6

Organic Materials

Answer 6

Include compounds containing carbon from living organisms

Question 7

Minerals in the crust of the Lithosphere

Answer 7

The lithosphere is made of solid and inorganic compounds called minerals

Question 7

A mineral

Answer 7

is a naturally occuring material and not produced by living organisms

Question 8

Metals

Answer 8

elements or alloys that are shiny, malleable, hard substances; they conduct heat and electricity; they form crystals when solid and naturally occur in minerals

Question 9

3 Rock types

Answer 9

1. Igneous rock
2. Sedimentary rock
3. Metamorphic rock