1. Which horizon is the TOPSOIL? A.Horizon O B.Horizon A
C.Horizon B D.Horizon D or R
Slide 3
2. Which statement best describes the BEDROCK? A.Mixture of
sand, silt, and clay B.Gravel and cement C.Partially weathered
rocks D.Solid rocks that have not been weathered
Slide 4
3. Which soil layer contains litter, bugs, twigs, dead leaves,
grass clippings, and insects? A.Organic layer B.Top soil C.Sub soil
D.Broken rock layer
Slide 5
4. Soil formation begins with the weathering of __ A.Rocks
B.Subsoil C.Litter D.Humus
Slide 6
5. Which horizon contains most of the HUMUS? A.Horizon O
B.Horizon A C.Horizon B D.Horizon D or R
Slide 7
6. Which soul layer contains silt, clay, sand, minerals, and a
small amount of humus? A.Organic layer B.Top soil C.Sub soil
D.Bedrock
Slide 8
7. Which of the following best describes HUMUS? A.Litter,
leaves, bugs, and animal remains B.Decomposed organic materials
C.Mixture of sand, silt, clay, and nutrients D.Rocks that have not
been weathered
Slide 9
8. What is the main source of soil formation? A.Weathering of
rocks B.Weathering of trees C.Acid precipitation D.Stalagmites and
stalactites
Slide 10
9.Which statements are TRUE about TOPSOIL? IContain decayed
organic materials IIIs made mostly of weathered rocks IIIIs made of
red clay IVIs the most fertile soil layer VContains most of the
humus A.I, II, and V B.I, IV, and V C.II, III, and V D.II, IV, and
V
Slide 11
10. The reason earth has soil and no other planet has soil is
due to A.Weathering B.Water formation C.Ice Formation D.Heat from
the sun
Slide 12
11. Which soul layer contains most of the HUMUS? A.Organic
layer B.Top soil C.Sub soil D.Broken rock layer
Slide 13
12. What do the decomposers (micro- organisms) do with the
materials to produce Humus? A.Store moisture B.Break down and
digest organic materials C.Make space for air and water D.Burrow
deep into the soil
Slide 14
13. A soil sample characteristics are listed below. Which
horizon did the soil sample come from? A.Horizon O B.Horizon A
C.Horizon B D.Horizon C Characteristics Sandy Beige City Small
roots Silt
Slide 15
14. Soil is important because it provides ____ A.Nutrients for
plants B.Storage for water C.Housing for animals and insects D.All
of the above
Slide 16
15. Soil layers are described with the letters W,X,Y,Z. Which
order is listed correctly from top to bottom? A.W, Y, Z, Z B.Y, W,
X, Z C.Y, X, W, Z D.Y, W, Z, X W = Silt and Clay X = Bedrock Y =
Decayed organic matter Z = Weathered rocks
Slide 17
16. What is the smallest particle of a rock? A.Gravel B.Silt
C.Clay D.Sand
Slide 18
17. How does the formation of weathered rocks in a soil profile
form? A.They are formed from bedrock B.They are formed from the
subsoil C.They are formed from the organic layer D.They are formed
from topsoil
Slide 19
18. Which of the following causes mechanical weathering?
A.Expanding ice B.Expanding tree roots C.Rocks falling on other
rocks D.All of the above
Slide 20
19. Weathering and erosion by running water over thousands or
millions of years probably created which of the following?
A.Himalayans Mountains B.Grand Canyon C.London Bridge D.Statue of
Liberty
Slide 21
20. What is the most likely reason why the rocks at point 3 are
smoother and rounder than the rocks at point 1? A.Rocks at point 1
have been weathered more B.Rocks at point 3 have been weathered
more C.Rocks at point 1 are metamorphic rocks D.Rocks at point 3
are softer than rocks at point 1
