1. Mountains Compare types of mountains.
Essential Questions:
Compare types of mountains.
Identify the forces that shape Earth’s mountains.

2. Mountains
There are four main types of mountains: fault-block, folded, upwarped, and volcanic.
Each type forms in a different way and can produce mountains that vary greatly in size.

3. Mountains
The ruggedness of a mountain chain depends largely on whether or not it is still forming.
Stopped forming Still forming

4. Mountains
Infer what determines how rugged and high a mountain chain is.
Whether or not it is still forming.

5. Mountains Define fault-block mountains.
Sharp, jagged mountains made of huge, tilted blocks of rock that are separated from surrounding rock by faults and form because of pulling forces
Define fault-block mountains.
Sierra Nevada in California

6. Mountains
Rock layers get pulled in opposite directions, large blocks slide downward, creating valleys and peaks.
Describe how fault-block mountains form.

7. Mountains Define folded mountains.
Mountains that form by the folding of rock layers caused by compressive forces
Define folded mountains.
Appalachian in Maryland

8. Mountains
Compression: two plates are pushed together, this causes rock layers to buckle and fold
Describe how folded mountains form.

9. Mountains Define upwarped mountains.
Mountains that form when forces inside Earth push up on the crust
Define upwarped mountains.
Rocky Mountains in Colorado

10. Mountains
Forces inside Earth push up the crust; with time sedimentary rock layers erode exposing igneous and metamorphic rock
Describe how upwarped mountains form.

11. Mountains Define volcanic mountains.
Mountains that form when magma is forced upward and flows onto Earth’s surface
Define volcanic mountains.
Mt St Helens in Washington

12. Mountains
Magma from inside the Earth, called lava after it reaches Earth’s surface, cools. Over time, layer upon layer of lava piles up creating a cone shaped feature.
Describe how volcanic mountains form.

13. Uplift
If you were to place wooden blocks of various thickness in a container of water you would notice that different blocks of wood would float at different heights.
The thicker wood would float higher in the water than the thinner blocks would.

14. Uplift
With the blocks, the buoyant force of water is balancing the force of gravity.
A similar process called ISOSTASY occurs in Earth.
Principle stating that Earth’s lithosphere floats on a plasticlike upper part of the mantle called the asthenosphere
Define isostasy

15. Uplift
The principle of isostasy is why the crust under mountains is thicker than it is elsewhere.
Isostasy also the floating of icebergs.

16. Mountains
Pictures

17. Mountains
Pictures