Why is slash-and-burn agriculture so ecologically damaging?
a. Fires frequently spread to much larger areas than intended
b. Areas are repeatedly burned before they can grow back.
c. Ash prevents new plants from growing.
d. Crops can only be grown for a few years before a new area must be burned.
e. Exposed soil soaks up rainfall, decreasing the amount available for surrounding trees.
d
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What is meant by desertification? Describe how the process of erosion leads to a loss of water-holding capacity and, hence, to desertification
What will be an ideal response?
What is the largest biogeochemical cycle?
A) Global Carbon cycle B) Global Nitrogen cycle C) Global Phosphorus cycle D) Global Silicon cycle
Beaching drifting:
a. is the landward migration of beaches due to rising sea level. b. is the erosion of beaches during storms. c. occurs in the breaker zone. d. occurs because of incomplete wave refraction. e. occurs because of the action of the longshore current.
Which rock layer is the oldest in this image?
What will be an ideal response?