1. How do scientists know that there is the same amount of freshwater on Earth as there has always been?
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What did the pattern of earthquakes in the wadati-benioff seafloor zones show scientists? a.) earthquakes occur where the ocean floor reaches its highest temperatures. b.) many earthquakes take place 700 kilometers below the seafloor. c.) slabs of ocean floor return to the mantle in subduction zones. d.) ocean - trenches cause earthquakes.

Countries trade with each other because resources are not evenly distributed across the globe. true or false

How much damage is done by landslides in a typical year in the u. s.?