In your own words, please explain why does the ocean crust sink?

(Note- The image below should be able to help you out a bit if you're having trouble)

The steps in the formation of extrusive igneous rocks are listed below in an incorrect order: 1. rock melts due to high temperature. 2. rock is buried deep under earth's surface. 3. magma is forced out of earth's surface during volcanic eruption. 4. lava cools and crystallizes to igneous rock. which of these best shows the correct order of steps in the formation of extrusive igneous rocks? 1, 3, 4, 2 2, 1, 3, 4 3, 4, 2, 1 4, 2, 1, 3

Is genetic diversity the same as genetic variation?

What is it called when lava when it erupts from the surface through volcanoes.