The deepest parts of the ocean are hostile to life. A barren stretch of sea floor recently experienced an earthquake that opened up a hydrothermal vent. This vent provides heat and nutrients. Over time, the area became filled with various deep-sea life forms. What kind of ecological activity is this?

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.