Based on climate reconstructions, there is ample evidence that climates have fluctuated throughout Earth's long history. Describe some of the mechanisms of this climate fluctuations
What will be an ideal response?
Several examples may include solar variability (sun spot activity), changes in Earth-Sun relationships (Milankovitch Cycles), plate tectonics and orogenies, and changes in concentrations of atmospheric gases and aerosols.
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A soldier fires a bullet an angle of 10° below the horizontal. At the same time he drops another bullet from the side of the gun. The bullet to hit the ground first is
A. the dropped one. B. the fired one. C. both hit at the same time D. no way to tell
Myelin, the coating of nerve axons, is which type of lipid?
A) cephalin B) lecithin C) simple lipid D) sphingolipid
The primary cause of BP's Deepwater Horizon oil spill in the Gulf of Mexico was ____.
A. faulty equipment and poor decision-making B. a tsunami C. an earthquake D. the oil rig crashing into an underwater reef E. leakage from old, rusty pipes
Is extinction natural? How has the extinction rate changed over time? Why are extinction rates today different than in the past?
What will be an ideal response?