Can someone please answer today

What was the great rift valley formed by

The ozone hole is at its biggest each year in the ? hemisphere in the ? season.

Which of the following statements best describes east asia? a. east asia is known to be the crafle of civilizationb. east asia is one of the world's most populates placesc. east asia is one of the worlds riches placesd. east asia is located near the equator me asap huhu