Topic: Size & Shape of the Earth

What do we use to represent different objects or systems on Earth?

Models

• Models –

Some examples include:

Evidence for Earth’s Shape

1)____

2) Lunar Eclipse –

3)___

Actual shape of the Earth

Flatter at poles, wider at equator , caused by…._________________

Earth’s Shape –_________

But Earth appears to be a perfect sphere from space!

Bulge inward - Greater gravitational pull Closer to the center of gravity

Bulge outward

Less gravitational pull further away

from center of gravity

Center of gravity

How could we figure out what the circumference of the Earth is?

I have an Idea!!!I think the Earth is round.

Also, the Sun’s rays are parallel.

Than we could use the following formula to determine the circumference of the Earth

If I know the distance between two points on the Earth 4900

Stadiaand if the angle of the shadow created by the Sun’s rays at one of the locations is 0 degrees and I know the angle of the shadow created at the second location

7 Degrees

0 Degrees

Spheres of the Earth

Atmosphere

•___________________________________________________

Properties of the Atmosphere

Pg. 14 of your best friend.

Hydrosphere

•_________________________________________________

Lithosphere

•________________________________________________

Properties of the LithospherePg. 1 of your best friend!!

Final Question

• http://www.polleverywhere.com/multiple_choice_polls/MjY5MzMzNjQ2/web