Q: Why does water infiltrate the ground? Choices: - gravity - prolonged drought conditions - run-off from flooding - because soil and rocks are porous A:
because soil and rocks are porous
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Q: What is an interesting example of a molecule with two central atoms, which are both c atoms? Choices: - chloride - water - sulfur - acetylene A:
acetylene
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Q: Land plants are classified into two major groups according to the absence or presence of what tissue? Choices: - disease - root - bacterial - vascular A:
vascular
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Q: What causes rivers to always flow downhill? Choices: - slope - pressure - diffusion - gravity A:
gravity
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