The correct answer is the sun.
The Earth's main energy source is the sun. The sun causes convection within the atmosphere, which in turn affects weather and climate.
Hydrosphere and atmosphere. those are the only 2 spheres that interact with each other in the air.
Explanation:
Except in the crust, the interior of the Earth cannot be studied by drilling holes to take samples. Instead, scientists map the interior by watching how seismic waves from earthquakes are bent, reflected, sped up, or delayed by the various layers.
