Earth Spheres. Earth's Spheres. Everything in Earth's system can be placed into one of four major subsystems: land, water, living things, or air. These four subsystems are called “spheres.” Specifically, they are the lithosphere (land), hydrosphere (water), biosphere (living things), and atmosphere (air).
Area under the line and above the axis on a velocity - time graph represents the displacement of the object.
Explanation:
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Increasing ; moving away
This indicates the light's wavelengths are (increasing) and the star or galaxy is (moving away.)
Answer: Two high and two low tides
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