Moon
How long does Earth's moon take to orbit Earth?
about a month
How many high tides occur in a day?
2
What would happen to the planets if there was no gravity?
They would fly all over the solar system
What is the term used to describe Earth's orbit around the sun?
Revolution
What is the name of a day when the number of daylight hours are the same as the number of nighttime hours?
Equinox
30
How many hours pass between high tide and low tide?
6
True or False: each planet orbits in a nearly circular path
True
What causes the lengths of shadows to change?
the apparent motion of the sun
What is the name of the longest day in the year?
Summer solstice
What causes the moon's phases?
How does the moon affect tides?
Tides are caused mostly by the moon's gravity pulling on Earth's water
What force affects the movement of the planets in the solar system?
gravity
The stars appear to move across the night sky. Why does this happen?
Earth rotates on its axis
What causes the seasons?
Earth's orbit and tilt on its axis
What path does a moon follow?
What creates the daily cycle of the tides?
Earth's rotation
Why is the length of a day different on each planet?
Each planet takes a different amount of time to complete one rotation
What causes a solar eclipse?
the moon moves between Earth and the sun
What happens in the Southern Hemisphere as the March equinox approaches?
the days become shorter
When does a lunar eclipse take place?
when a full moon crosses Earth's shadow
If it is high tide on one side of the Earth, what tide is it on the opposite side of the Earth?
High tide
How long is the revolution of the Earth?
365 days
What imaginary line separates the Northern and Southern hemispheres?
the Equator
What happens to the sun and the temperatures in the Northern Hemisphere on the December solstice?
the sun is lowest in the sky and the temperature is cold