1 / 11

MOUNTAIN BUILDING

M. MOUNTAIN BUILDING. Mountain Building Processes. What processes build mountains? Volcanic activity Tectonic Activity - Folding: Bending of rock -Faulting: Breaking of rock. Mountain Building. Mountain building processes thicken the crust

javen
Download Presentation

MOUNTAIN BUILDING

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. M MOUNTAIN BUILDING

  2. Mountain Building Processes • What processes build mountains? • Volcanic activity • Tectonic Activity - Folding: Bending of rock -Faulting: Breaking of rock

  3. Mountain Building • Mountain building processes thicken the crust • Mountains can be twice as thick as the average continental crust ( 70 km VS. 35 km) • Elevation of crust depends on thickness and density • Mountains have deep roots that extend into the mantle • As erosion occurs, mass is lost from the mountain and these roots begin to rise

  4. Isostasy: Crust-Mantle Relationships • Displacement of the mantle by Earth’s continental and oceanic crust • Crust and mantle in equilibrium when gravity is balanced by the upward force • Isostatic Rebound: slow process of crust rising as a result of the removal of overlying material

  5. Convergent Boundary Mountains • Oceanic-Oceanic: 2 oceanic plates; one descends into mantle, melts, then magma forced upward forming island arc which thickens to form root, displaces the mantle, forming mountain peak

  6. Convergent Boundary Mountains • Oceanic-Continental: Plates come together, create subduction zone, produce major mountain belts due to the descending ocean plate forcing continental plate up; as crust thickens, higher and higher mountains form

  7. Convergent Boundary Mountains • Continental-Continental: Creates tallest mountains (Himalayas); it is the energy from the collision of these plates that that causes the crust to fold and fault; can double the thickness of the crust

  8. Divergent Boundary Mountains • Ocean ridges formed from rising convection cells that form in mantle; divergent boundary bulges upward form gently sloping mountain range

  9. Non Boundary Mountains • Uplifted Mountains: form when large regions of Earth have been slowly forced upward as a unit. (this concept is not well understood on why this happens)

  10. Non Boundary Mountains • Fault-Block Mountains: Form when large pieces of crust are tilted, uplifted, or dropped downward between large faults

  11. Non Boundary Mountains • Volcanic Peaks: Volcanoes that form over hot spots form far from any tectonic plate boundaries.

More Related