How long does it take the Earth to complete one orbit of the Sun?
It takes 365 days, or one year, for the Earth to orbit the Sun.
What causes day and night on Earth?
Day and night happen because the Earth rotates on its axis. When one side faces the Sun, it is daytime, and when it turns away, it is nighttime.
What does the Earth's tilt make?
The Earth's tilt causes the seasons. Different parts of the Earth get more or less sunlight at different times of the year.