The mid-ocean ridge is formed during seafloor spreading when two tectonic plates move apart. What kind of boundary is this?

In a soil profile, the bottom horizon is also called horizon D. What makes up this hard layer?

What events increased the salinity (salt content) of the ocean?

What salt mostly makes up the ocean?

What causes surface waves and surface currents?

The sun's rays warm our atmosphere through empty space. This is an example of _________

What causes the daily rise and fall of sea level known as the tide?

Deep water currents in the ocean are caused by:

Within our atmosphere, heat is mostly transferred when warm air or water rises and cool air or water sinks. This is an example of what?

Our atmosphere is MOSTLY made of:

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