chapter 29.1

Question 1

what is a round, three dimensional object , and the surface of which is the same distance from the center in all directions?

Answer 1

sphere

Question 2

what is an elongated , closed curve with two foci?

Answer 2

ellipse

Question 3

is earth a perfect sphere?

Answer 3

No, the equator is longer then pull to pull

Question 4

what are some the the ancient observatio?

Answer 4

1. object fall straight down
2. earth’s shadow on the moon
3. people see different parts of the worlds see different stars

Question 5

what are two factors that affect gravitational pull?

Answer 5

masses and distance

Question 6

which diameter of earth pole to pole or equator , is the greatest?

Answer 6

equator

Question 7

what does the magnetic field protect the earth from?

Answer 7

harmful radiation

Question 8

which magnetic pull is located in the northern hemisphere?

Answer 8

South magnetic pole

Question 9

at what degrees is earth axis at?

Answer 9

11.7 degrees

Question 10

does the Magnetic pole reverse?

Answer 10

yes

Question 11

what are the large scale movement call when they reverse?

Answer 11

magnetic reversal

Question 12

on average when does the magnetic reversals occur

Answer 12

200,000

Question 13

how long ago did the last magnetic reversal happen?

Answer 13

780.000 years ago

Question 14

what part of earth’s magnetic field deflects harmful radiation from the sun?

Answer 14

Magnetosphere

Question 15

what are the two scientific names of the northern and the southern lights?

Answer 15

aurora Borealis

aurora Australis

Question 16

how are the aurora created?

Answer 16

electrically charged particles collide with atoms in the atmosphere and emit light

Question 17

what month are we closes to the sun?

Answer 17

january- 147 million km

Question 18

which month are we farther from the sun

Answer 18

july-152million km

Question 19

what has an area of 15 degrees wide in which the time is the same?

Answer 19

time zone

Question 20

what is the spinning of earth on it’s axis called?

Answer 20

Rotation

Question 21

what is the motion of Earth an elliptical orbit around the sun called ?

Answer 21

Revolution

Question 22

What is defined as the plane of Earth’s orbit around the sun called?

Answer 22

ecliptic

Question 23

what is it called when Earth’s rotational axis is tilted directly toward the sun or away from the sun?

Answer 23

Solstice

Question 24

what is Earth’s rotational axis is perpendicular to a line drawn from the center of Earth to the center of the sun called?

Answer 24

equinox