Answer:
I believe it is D
Explanation:
Scientists cut open ice cores to look at gases to see the gas concentration and therefore the climate change
Answer:
In summer in the North Hemisphere, Earth is tilted and Closer to the Sun on the North.
Explanation:
Water in the deep ocean is more dense water than the surface layer. Naturally, more dense fluids and solids will be on the bottom and less dense fluids and solids will flow to the top.