Question

during which moon phase do spring tides occur?
new moon and full moon
first quarter and third quarter
waxing gibbous and waning gibbous
waxing crescent and waning crescent

Explanation:

Spring tides occur when the gravitational forces of the sun and the moon combine. This happens during the new moon phase (when the sun, moon, and Earth are in a line with the moon between the sun and Earth) and the full - moon phase (when the sun, Earth, and moon are in a line with Earth between the sun and moon).

Answer:

new moon and full moon