What is a crack in the earth's crust?

How do convection currents form underwater mountains?

How are people today protected from wildfires like the large wildfires like the great fire of 1910are people today protected from large wildfires like the great fire of 1910? plz have the answer. this is important. you

Ozone in the upper atmosphere has been depleted by a. sulfur dioxide. b. chlorofluorocarbons. c. carbon dioxide. d. oxygen.