Ch 29.1

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 width is longer then the height of it.

Question 4

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

Answer 4

No matter where you are at if you drop something it falls down to the center, the shadow of the earth is always going to have a shadow on the moon during a Lunar eclipse, everyone does’t see the same stars we all see different ones

Question 5

What are two factors that attract gravitational strength?

Answer 5

Mass & Distance

Question 6

Which diameter of Earth pull to pull or of the equator is longer?

Answer 6

Equator

Question 7

What does the magnetic field protect Earth from?

Answer 7

Harmful radiation from the sun

Question 8

The south magnetic pole is located in which hemisphere?

Answer 8

The north hemisphere

Question 9

What degree is Earth axes tilted at?

Answer 9

11.7

Question 10

Do the magnetic poles reverse?

Answer 10

Yes they do

Question 11

What is the large scale reversal called?

Answer 11

Magnetic reversals

Question 12

How often do magnetic reversals occur?

Answer 12

200,000 years

Question 13

When was the last magnetic reversal?

Answer 13

780,000 years ago

Question 14

What part of the magnetic field deflect harmful radiation from the sun?

Answer 14

Magnetosphere

Question 15

What are the northern and southern lights called?

Answer 15

Northern- aurora borealis

Southern- aurora australis

Question 16

How are the auroras created?

Answer 16

Electrically charged particles collide with atoms in the atmosphere

Question 17

Which month is Earth closest to the sun?

Answer 17

In January (147 million km away)

Question 18

Which month are we the farthest from the sun?

Answer 18

In July (152 million km away)