LAYERS OF THE EARTH

Question 1

The crust and uppermost part of the mantle comprise the _________, a rigid layer that can break under stress.

Answer 1

lithosphere

Question 2

The lithosphere is composed of major and minor blocks, called _________ that interact and create the tectonic activities on earth.

Answer 2

tectonic plates,

Question 3

Below the lithosphere is the ________, which about 180km thick and contains hot, molten rocks or magma.

Answer 3

asthenosphere

Question 4

The asthenosphere can deform and reshape by heat energy, which circulates as ________, travelling upward from the hot lower mantle to the cooler upper mantle.

Answer 4

convection currents

Question 5

Outermost layer of the Earth where life exists

Answer 5

Crust

Question 6

Outermost layer of the Earth where life exists

Answer 6

Crust

Question 7

Types of Crust

Answer 7

Continental
Oceanic

Question 8

40 – 70 km thick
Made up of light granitic rocks, made up mostly aluminum silicates

Answer 8

CONTINENTAL CRUST

Question 9

Composed of dense basaltic rocks made up of magnesium silicates
Thickness of oceanic crust is 5km

Answer 9

OCEANIC CRUST

Question 10

Semisolid, rocky and very hot layer
Measuring about 2900km thick
Composed of ferro – magnesium silicate rocks

Answer 10

Mantle

Question 11

Its top layer has a temperature of about 900°C
As one goes deeper, the temperature increases from 1000°C to 3700°C

Answer 11

Mantle

Question 12

Only layer of the Earth that is liquid
Made up of molten nickel and iron
It has about 2270 km thick and has temperature that ranges 3700 °C to 4300 °C

Answer 12

Outer core

Question 13

An extremely hot, solid sphere of mostly iron and nickel at the center of the earth. Temperature: 6000 °C

Answer 13

Inner core