This Egyptian invented the study of geography and calculated the circumference of the Earth?

This layer of our planet is hot, solid, and six times as dense as granite?

This water compartment holds 97% of all liquid water on Earth?

This is the depth where the temperature drops rapidly?

This is when the tide is turning?

At what latitude do hurricanes not form?

The distance over water that the wind blows in the same direction?

What is the most common type of salt in the ocean?

This is the part of the carbon cycle that releases carbon?

This type of bond occurs when you give and take entire electrons?