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what are the effects of seawalls and groins? select two effects.

a. restore damaged beaches

b. control beach deposition by wind

c. hold back floodwater from rivers

d. cause problems for nearby beaches

e. allow floodwater flow into drains

f. prevent beach erosion by ocean waves

Why are fossils of organism's from the phanerozoic eon much more likely to be found than fossils of organisms from any other eon? a. more organisms present during the phanerozoic eon had soft body parts. b. organisms present during the phanerozoic eon were all microscopic. c. more organisms present during the phanerozoic eon had hard body parts. d. organisms present during the phanerozoic eon are the most ancient life forms.

Which occurs when air is compressed? air molecules move slower. air temperature rises and air molecules move faster. air temperature decreases. air temperature decreases and air molecules move faster.

Which factors add to the greenhouse effect and are caused by human activities?