What two objects in space effect tides on Earth?

Gravity is one major force that creates tides. In 1687, Sir Isaac Newton explained that ocean tides result from the gravitational attraction of the sun and moon on the oceans of the earth (Sumich, J.L., 1996).

Explanation:

Gravity is one of the foremost powers producing tides. Sir Isaac Newton defined in 1687 that the ocean tides are the product of the gravitational impact of the sun and moon on earth's oceans (Sumich, J.L., 1996)

the answer is b & c i believe : )

1. they vary with a higher number because boiling is way hotter than melting