Biosphere reprezents all the living forms
geosphere includes bisphere, hidrosphere and atmosphere
hydrosphere represents the the water on Earth
atmosphere is the gas on Earth, so the correct answer is D - ATMOSPHERE
A mid-ocean ridge or mid-oceanic ridge is an underwater mountain range, formed by plate tectonics. This uplifting of the ocean floor occurs when convection currents rise in the mantle beneath the oceanic crust and create magma where two tectonic plates meet at a divergent boundary.
