Chapter 17 Lesson 1 Study Guide – Earth’s Cycle
We can’t feel Earth’s movement
because Earth moves steadily and smoothly.
The spinning of Earth around its
axis is called rotation.
Earth rotates on its axis once every
Earth rotating from west to east is
a reason why day turns into night on Earth.
The force of gravity keeps Earth
revolving around the Sun.
The tilt of Earth causes the seasons
to change on Earth.
The seasons changing during the year
is a clue that Earth is moving.
Earth rotates fast – more than 1,000 miles per hour at the equator.
Earth takes one year or 365 days to go all around the Sun at one time.
10. The equator does not have four seasons. It is almost always directly
facing the sun’s rays, so it is warm year
11. The poles are never facing the sun’s rays directly so they are cold year round.
12. When a place on Earth is turned away from the Sun, it is night at that spot.
** Vocabulary Words to study for our test!!
13. Axis – an imaginary
line that goes through an object; Earth’s axis goes through the North and South
14. 14. Rotation – the spinning of a planet, moon, or star
around its axis
15. 15. Revolution – the
repeated motion of one object around another, much more massive object; for
instance, the motion of the Earth around the Sun
16. 16. Orbit – the path followed by one object as it
revolves around another object, such as Earth’s orbit around the Sun
17. 17. Ellipse – an oval-shaped curve that is like a circle
stretched out in opposite directions