Ch 29.1 Notes and Vocab

Question 1

A round, three dimensional object, the surface of which is the same distance from the center in all directions

Answer 1

Sphere

Question 2

An elongated, closed curve with two foci

Answer 2

Ellipse

Question 3

Is Earth a perfect sphere?

Answer 3

No, the equator is longer than pole to pole

Question 4

What are some of the ancient observations to prove that Earth is a sphere?

Answer 4

1. Gravity
2. The Lunar Eclipse
3. People in different parts of the world see different stars

Question 5

What are two factors that affect gravitational pull?

Answer 5

The object’s Mass and Distance between them

Question 6

Which diameter, pole to pole or equator is the greatest

Answer 6

equator

Question 7

What does the magnetic field protect Earth from

Answer 7

Harmful Solar radiation

Question 8

Which magnetic pole is located in the northern hemisphere?

Answer 8

South

Question 9

At what degrees is Earth’s axis tilted at?

Answer 9

11.7 degrees

Question 10

Can the magnetic reverse?

Answer 10

Yes, they change slowly over time

Question 11

What is the large scale movement where the magnetic poles reverse

Answer 11

Magnetic reversals

Question 12

On average how often do magnetic reversals occur

Answer 12

about 200,000 years

Question 13

How long ago did the last magnetic reversal happen

Answer 13

The last magnetic reversal happened about 780,000 ago

Question 14

What part of Earth’s magnetic field deflects harmful radiation from the sun

Answer 14

the magnetosphere

Question 15

What are the two scientific name of the northern lights and the southern lights

Answer 15

Aurora Borealis (north) Aurora Austrialis (south)

Question 16

How are the auroras created

Answer 16

electrically charged particles from the sun collide with atoms in the atmosphere

Question 17

What month are we closest to the sun?

Answer 17

January (147 million km away)

Question 18

What month are we farthest from the sun

Answer 18

July (152 million km away)