Question

nitrogen makes up 78% of earths _______.
lithosphere
atmosphere
ocean
what causes day and night on the earth?
earths orbit
earths rotation on its axis
lunar eclipses
about 70% of earths surface is covered with _______.
land
continents
water
the three main layers of the earth are the mantle, crust, and _______.
core
liquid rock

Explanation:

1. Nitrogen is the most abundant gas in the layer of gases surrounding Earth.
2. The spinning of Earth on its axis creates alternating periods of light and dark.
3. The majority of Earth's surface is covered by oceans, seas, and other bodies of water.
4. Earth's internal structure is divided into three primary layers, with the innermost being the core.

Answer:

1. atmosphere
2. earth's rotation on its axis
3. water
4. core