A. collapsing dust clouds
Option B (Sudan)
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I believe the answer you're looking for is temperature and precipitation.
Climate is based on the amount of rainfall (i.e. a rainforest) or the temperature (i.e. a tropical climate)
The Thames, my dear child.
*** River Thames***
not ''Thames River''
Answer:
a 1.7 million year history of dinosaurs off the Mississippi River delta
Explanation: