Explanation:

- The point at which the earth and the sky seem to meet in the distance is commonly referred to as the "horizon." It is the line that separates the visible earth from the sky.

- Crust: This refers to the outermost layer of the earth, not related to where the sky meets land or water.

- Horizon: This is indeed the correct term for the line where the earth's surface and the sky appear to meet.

- Rainbow: This is an optical phenomenon that we see when light is refracted and dispersed in water droplets, resulting in a spectrum of light.

- Ocean: This is a large body of saltwater that covers much of Earth's surface, but it doesn't describe the line where sky meets land.