What is the biggest environmental issue facing humanity?
A. Volcanic eruptions may cause climate change
B. Depletion of local drinking water supplies
C. Sustainability
D. Coastlines may be drowned by rising sea levels
Answer: C
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A major factor that allowed species to adapt to new environments and form new species through natural selection happened
a. because Pangaea began splitting apart about 135 million years ago b. about 18,000 years ago when South America and North America split apart c. about 200-250 million years ago when India and Africa split apart d. happened about 250 million years ago, because Pangaea began splitting apart e. because Asia and North America split apart 180 million years ago
What happens when river slopes are uplifted beyond their maximum stable slope?
A) They are usually returned to the maximum stable slope by landslides. B) They are usually returned to the maximum stable angle by erosion. C) They usually remain at the uplifted angle but are more unstable when earthquakes occur. D) The river water fills the deeper crevice and maintains that depth.
There are inexpensive ways to effectively remove most pollutants from contaminated groundwater.
Answer the following statement true (T) or false (F)
Many molecular collisions do not result in chemical reaction. Why is this?
A) The colliding molecules are not the correct chemicals. B) The colliding molecules do not have sufficient energy. C) The colliding molecules do not have the correct orientations. D) all of the above