12. Which statements is TRUE about the mantle,
A. The mantle is the layer below the crust.
B. The mantle is Earth's thinnest layer.
C. The lower mantle is made of hard rock
D. The upper mantle is made of liquid metals.
13. The soft layer of the mantle on which the lithosphere floats is the
A. atmosphere
C. hydrosphere
B. outer core
D. asthenosphere
14. Temperature
as you move towards the center of the earth.
A. decreases
C. increases
B. does not change
D. stays the same
15. Which describes how convection currents move inside Earth.
A. Hot materials rise, while cooler materials sink.
B. Hot materials sink, while cooler materials rise.
C. Hot materials move up or down, while cooler materials move sideways.
D. Hot materials rolled up and down due to hot temperature,
16. Which type of soil is considered as the gardener's bestfriend?
A. loam soil
C. sandy soil
B. clay soil
D. peat soil
17. Which of the following layers of the soil is located at the topmost layer?
A. bedrock
C. parent material
B. subsoil
D. humus
18. It is composed of the bodies of plants and animals that are being reduced to finely
divided organic material by humification.
A. O horizon
C. B horizon
B. A horizon
D. R horizon
19. A soil that has a balanced amount of sand, silt and clay has which one of the following
for a texture?
A platy
C. silt
B. loam
D. granular
20. It is a process that breaks rocks down into smaller pieces this includes wind and water
A. physical weathering
C. chemical weathering
B. biological weathering
D. chemical reaction
21. It is the rate at which water moves through the soil.
A. porosity
C. permeability
B. hydraulic speed
D. saturation potential
22. Which does NOT belong to the group?
A. slope
C. shape
B. topography
D. rock
23. Which one of the following is NOT considered one of the major constituents of soll?
A. mineral
C. organic matter
B. chemical
D. pore space
24. What is the best soil texture in terms of water availability for plants?
A. clay soils
C. silt soils
B. sandy soils
D. loamy soils
25. The usual vertical sequence of horizons in a soil from the surface downward is;
A. O, A, B, C, E, R
C.0, A, E, B, C, R
B. A, B, C, E, 0, R
D. A, E, B, C,O,R
26. Which energy resources does NOT belong to the group?
B. wind
C. fossil fuels
A. trees
D. sun
27. What is one disadvantage of coal?
A. Coal produces air pollutants
B. There isn't a lot of coal left which makes it expensive
C. The world isn't using a lot of coal which makes it an undesirable job
D. You can only use it to roast hot dogs and cook hamburgers​