Question

When are tides in Earths oceans the highest?
1. during the moon's waning gibbous phase
2. during the moon's waxing gibbous phase
3. when the moon is at a right angle to the sun
4. When the sun, Earth, and moon are in a line.

Answer 1

4. aligns the gravitational forces, thus causing the greatest deformation of the water as tides.

Answer 2

...hence causing spring tide.