I think your answer is B.) The objects must be in direct contact with one another
Oceans, rivers, valleys, mountains, plains, hills and glaciers are some examples.
Answer:
Limestone areas are predominantly affected by chemical weathering when rainwater, which contains a weak carbonic acid, reacts with limestone. This causes the limestone to dissolve. Carbon dioxide from the respiration of animals (and ourselves) is one cause of increased carbon dioxide in the atmosphere.
Advanced cities are center for trade with a large population and an organized government a long-lasting pattern of organization in a community such as economy, religion, government, education
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(jacemorris04)
<span>" "both positive and negative temperature feedback loops.</span>
