Day and night
What is day?
The period of time when a place on Earth is facing the Sun and has daylight.
Key Points:
Happens when a part of the Earth faces the Sun.
The sky is bright because of sunlight.
Plants and animals are usually active during the day.
Day length is about 12 hours on average, but it changes with seasons.
Caused by the rotation of the Earth on its axis.
What is night?
The period of time when a place on Earth is facing away from the Sun and it is dark.
Key Points:
Happens when a part of the Earth faces away from the Sun.
The sky is dark because sunlight doesn’t reach that side.
Most animals are less active or sleep during the night.
Night length is about 12 hours on average, but it changes with seasons.
Caused by the rotation of the Earth on its axis.
Why does Earth spins?
Formation of Earth.
Spinning started naturally.
Some motion is still there.
Fun fact:
On the Moon, a single day lasts 29 Earth days, so daytime and nighttime are longer there.