Use what you learned about tides to complete the sentences. The pull of gravity of causes Earth's crust and oceans to bulge. This creates high and low tides. Tides occur when the Sun, the moon, and Earth are nearly aligned. Tides happen when the Sun and the moon are at right angles to each other. Each of these special tides happens in a lunar cycle.

1) sun and moon

2) spring

3) neap

4) twice

Explanation:

Given the sentences in the question and the knowledge of Tide, the sentences would be fully witten as:

The pull of gravity of SUN and MOON causes Earth's crust and oceans to bulge. This creates high and low tides. SPRING Tides occur when the Sun, the moon, and Earth are nearly aligned. NEAP Tides happen when the Sun and the moon are at right angles to each other. Each of these special tides happens TWICE in a lunar cycle.