Answer: C) by a volcanic eruption.
The Geosphere is the crust of the Earth while the Atmosphere is the whole mass of air surrounding Earth, or also known as the sky. Geosphere can effect the Atmosphere by the Sun's radiation which resides in the Earth's core, hot and molten lava. Volcanic eruptions can cause a change in weather which will effect the Atmosphere. The gas and dust particles from the ash will have influences on the climate such as reducing the temperatures by decreasing the amount of sunlight reaching to the surface of Earth.
