LO: students will be able to explain why scientists use models to study scientific phenomena. S2a, S4a What’s this? Hint: I’m not a skeleton!

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Presentation transcript:

LO: students will be able to explain why scientists use models to study scientific phenomena. S2a, S4a What’s this? Hint: I’m not a skeleton!

Earth is not perfectly round! What shape is the earth? Earth is not perfectly round!

Earths actual shape is an oblate spheroid Which picture would do you think would BEST represent this type of shape?

*****The true shape ( true model) of Earth is an oblate spheroid. LO: SWBAT explain why scientists use models.

an oblate spheroid is a sphere that is slightly flattened on the top and bottom and bulging on the sides.

***if Earth were a perfect sphere, its equatorial diameter and polar diameter would be the same!

** accurate measurements show that Earth is not a perfect ball!

***Earth’s equatorial diameter is slightly more than its polar diameter!

a person weighs slightly more at the poles than the equator. Because one is slightly closer to Earth’s center at the poles, one weighs slightly more at the poles.

Is the earth’s surface smooth? NO it is not!!!!!

Earth has many rough surface features such as mountains, hills and valleys

Do you know what kind of map this is?

this is a relief map. Relief maps are maps that show the surface features of Earth in 3-D

Relief maps are drawn to scale… the surface features are in proportion to the real surface feature.

Since relief maps are in proportion to the real Earth Since relief maps are in proportion to the real Earth. One can use a proportion equation to determine the size of objects on both the real earth and on the relief.

relief height or depth of surface feature (cm) Actual height or depth of surface feature (km) Relief globe diameter (cm) Earth diameter (km)

Percent deviation: Percent deviation from the accepted value Difference from accepted value Percent deviation from the accepted value X 100 accepted value

READ THE DIRECTIONS AND COMPLETE THE LAB. Independent work: Lab 1-2: EARTH’S SHAPE READ THE DIRECTIONS AND COMPLETE THE LAB. LO: SWBAT explain why scientists use models.