Hello there!
The only one i can see caused primarily by human activities would be A. Air Pollution.
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Answer: We study other star systems in spaceships and big, professional telescopes
A thermocline is the transition layer between the warmer mixed water at the surface and the cooler deep water below. It is relatively easy to tell when you have reached the thermocline in a body of water because there is a sudden change in temperature.
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The answer is True.
Many people doubt it because it's just sound too fictional.
Ring of fire located in the basin of pacific ocean, a large number of earthquake and volcano eruptions happen here.
The island arc is a string of islands formed by volcanoes along deep ocean trench.
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