Earth has both freshwater and salt water. About how much of Earth’s water is fresh water?

Each layer of the geosphere has mass. Which layer has the most mass?

Sometimes fires burn down large areas of forests that are part of the biosphere. Other than the biosphere, which of Earth’s other spheres is a forest fire most likely to affect?

What is the order of the layers of the geosphere when starting from Earth’s center and moving outward?

About how many times more nitrogen than oxygen is in the air?

Surface currents and waves form when energy from the sun causes two of Earth’s spheres to interact. Which two spheres interact to produce these waves and currents?

At different places on Earth, depending on elevation, air pressure varies. What causes atmospheric pressure?

As altitude increases, what happens to the pressure of the air?

Earth scientists have identified four distinct layers of the atmosphere. What is the correct order of these layers from lowest to highest?

Much of the ultraviolet radiation from the Sun is absorbed in the upper atmosphere. Which molecule is responsible for this?

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