Maps and models of the earth

12 terms by CherieVeit

Create a new folder

Advertisement Upgrade to remove ads

2000 years ago, the Greeks thought that the Earth was a perfect sphere - Earth actually bulges out around the

equator and is slightly squashed at the poles

Erotsthenes

Greek mathematician, calculated the Earth's circumference using geometry and observation of the sun - his estimation was off only 6,250 km, an error of 15%

Reference point

A fixed place on the Earth's surface from which direction & location can be described

North and South Poles

used as refence points when describing direction and location on Earth

Equator

also used as a refernce point when describing location on earth - a circle halfway between the poles that divides the Earth into the Northern and Southern Hemispheres

Cardinal directions

North, South, East, & West

Magnetic Compass

One way to determine North which uses the natural magnetism of the Earth to indicat direction

Magnetic North Pole

Where the compass needle points to

Geographic poles and Magnetic poles (have changed location throughout history)

The Earth has two different sets of poles

Geographic North Pole

never changes and is called true north

Difference between geographic north and magnetic north

When using a compass to map or explore the Earth's surface, you need to make correction for the

Magnetic declination (magnetic declination is different for different points on the Earth's surface

the angle of correction ... and is measured in degrees east or west of true north

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions above and try again

Example:

Reload the page to try again!

Reload

Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

NEW! Voice Recording

Create Set