Ch. 7 Earth in Space

Earth’s Orbit

1. The shape of the Earth is a sphere, but not a perfect sphere. It bulges a little at the equator and is a little flattened at the poles.

Earth’s Orbit

2. Earth’s round shape is caused by gravity, particles are pulled to the center giving the Earth it’s round shape.

Quiz time! Look on pg. 100 in your workbook.

(1.) What force shaped Earth into a sphere?

Quiz time! Write the answer to this question under 1 on pg. 100 in your workbook.

(2.) When objects are farther apart, their gravitational pull is (weaker or stronger).

Quiz time! Check your answers, how did you do?

(1.)Gravity shaped the Earth.(2.)When objects are farther

apart their gravitational pull is weaker. When an object is larger the gravitational pull is stronger.

Earth’s Orbit

3. The Earth spins on its axis, the imaginary line drawn from the north pole through the earth to the south pole.

Earth’s Orbit

4. The rotation of the Earth on its axis is what causes day and night.

Earth’s Orbit

5. The earth moves along a path around the Sun, this movement is called Revolution and takes 365 days (1 year) to complete this path.

Quiz time! Write your answers on pg. 101 below question 3.

(3.) How much time does it take for Earth to complete one revolution around the Sun? What causes Day and Night?

Quiz time! Check your answers, how did you do?

(3.) Revolution around the Sun takes one year (365 days). Day and night is caused by the Earth rotating on its axis.

Earth’s Orbit

6. The curved path around the sun is called an orbit and forms an ellipse or oval shape.

Earth’s Seasons

7. Because the Earth is tilted on its axis, the hemisphere facing the sun will receive more direct sunlight and will be warmer.

Quiz time! Look on pg. 102 in your workbook?

(4.) Why does Earth have seasons?

Quiz time! Look on pg. 102 in your workbook?

(5.) When it is winter in the northern hemisphere, what season is it in the southern hemisphere?

a. spring b. summer c. fall or d. winter?

Quiz time! Check your answers, how did you do?

(4.) The Earth has seasons because its tilted on its axis, as the Earth orbits around the sun the angle at which sunlight strikes the surface changes.

Quiz time! Check your answers, how did you do?

(5.) The hemisphere tilted toward the sun will have more daylight hours. When it is winter in the northern hemisphere it is summer in the southern hemisphere.

Earth’s Solstices

8. Twice a year the Sun reaches its greatest distance north and south of the equator. The Summer Solstice -June 21 or 22, when the Sun is highest in the sky at noon.

Earth’s Solstices

9. Winter Solstice- December 21 or 22, when the Sun is lowest at noon.

Quiz time! Look on pg. 103 in your workbook?

(6.) If the Sun is highest in the sky at noon during the summer solstice, when is it lowest?

Quiz time! Check your answers, how did you do?

(6.) During the winter solstice in December.

Earth’s Equinoxes

10. At an equinox the Sun is directly above the Earth’s equator and the lengths of day and night are nearly equal all over the world. The tilt of the Earth is not toward or away from the Sun.