The _________________ is the thin layer of Earth's atmosphere where life exists. (1 point)
[Choice A] geosphere
[Choice B] atmosphere
[Choice C] biosphere
[Choice D] hydrosphere
[Choice C] biosphere
The correct answer is [Choice C] biosphere.
The correct answer is [Choice C] biosphere.
To find the correct answer, you can break down the question into different parts and eliminate the choices that do not fit.
First, we know that the question is asking about a layer in Earth's atmosphere where life exists. This means we are looking for a term that describes the part of the Earth's atmosphere where living organisms can be found.
Option A, geosphere, refers to the solid, rocky part of the Earth including the crust, mantle, and core. This doesn't fit the description of a layer in the atmosphere.
Option B, atmosphere, refers to the blanket of gases surrounding the Earth. While the atmosphere is important for supporting life as it provides oxygen and regulates temperature, it is not specific enough to be the correct answer.
Option C, biosphere, is the term that best fits the description. The biosphere includes all living organisms on Earth and the environments they inhabit, which includes the layer of Earth's atmosphere where life exists.
Option D, hydrosphere, refers to all of Earth's water, including oceans, lakes, rivers, groundwater, and even water vapor in the atmosphere. While water is vital for life, the hydrosphere is not focused specifically on the layer of Earth's atmosphere where life exists.
Therefore, since the question specifically asks about the layer in Earth's atmosphere where life exists, the correct answer is [Choice C] biosphere.