When two continental plates collide, sometimes one plate slides beneath the other in a process known as subduction. image courtesy of the usgs when one continental plate slides beneath another a. material from the earth's surface is returned to the interior. b. material from the earth's interior is always returned to the surface. c. the process of melting returns material to the earth's surface. d. weathering and erosion work to build high plateaus and mountain ranges.

When does a spring tide occur? question 9 options: they occur when the sun, moon, and earth are aligned. in spite of their name, these tides occur twice a year in the spring and fall. they occur on the date of the vernal equinox each year, no matter what stage the moon is in. this is why they are called spring tides. they occur when the sun, moon, and earth are at 45-degree angles from each other. this happens once every spring. they occur when the sun, moon, and earth are aligned. in spite of their name, these tides occur all year long.