|Why are seashells found on Mt. Everest?
Millions of years ago, Mt. Everest was not a mountain at all. It was underneath the ocean! A lot has changed since then. The outer skin of the earth – both land and sea – rides on gigantic “plates”. Over millions of years, these moving plates collide with one another to form spectacular mountains.
How to make a mountain
Here are some of the ways that mountains form:
Two plates can press against each other until the land is lifted and folded over itself.
One plate can push on top of another one. As one plate slides downward into the earth, it begins to melt. The melted rock rushes upward along cracks and weak spots, bursting out as fiery volcanoes. You can see a huge “ring of fire” where volcanoes circle the Pacific Ocean.
Plates can stretch until they crack and slide, forming fault-block mountains.
In the ocean, great underwater mountains are formed when plates spread away from one another, and melted rock pushes up through the gap.
Glaciers carve out spectacular scenery in mountains. Glaciers pluck rock right out of the mountainside and carry it downward in a river of ice. Glaciers form sharp horns, rounded bowls, and U-shaped valleys.
Given enough time, millions of years generally, all mountains crumble. High jagged peaks become low rounded hills. Finally, mountains wear away to become soil on plains, sand on beaches, or sediments in oceans.
What makes mountains crumble? Rain, wind, and ice wear away mountains. Water gets into the cracks in rocks and pushes the cracks wider as it expands with both heat and cold. Water also dissolves some minerals, washing them out of the rocks. Eventually, the rocks crack and split off. Some crash down the mountain as boulders, others move only a tiny bit as clay particles.
Would you like to speed up geologic time to see mountains being made? Try these links:
My You Tube Channel
Visitors on The Site
Join 1,050 other subscribers
Fill This Form to Contact Me
Top Posts & Pages
- Social Geography: Concept,Origin,Nature and Scope
- Problems of Cities
- Migration Theories : Lee’s Push Pull Theory
- Concept of Cycle of Erosion(Davision Concept)
- Discontinuities Inside the Earth
- Differential Levelling
- Leisure and Recreation are Vital to Tourism Industry
- Main Determinants of Tourism Demand
- Scales in Geography: An Overview and Simple Method of Constructing Scales
- Rural-Urban Continuum: The Concept
- Article Submission
- Basics of Geography (Open Elective)
- Book Reviews
- Disaster Management
- Field Training and Tour
- Geography Notes
- Geography of Tourism
- Geography Study Material for NTA-NET & IAS Exams
- Geomorphology Class Black Board
- Hindi Posts
- Human Geography
- My Projects
- Online Class
- Physical Geography
- Posts on Geography Practicals and Statistical Techniques
- Regional Studies
- Settlement Geography
- Social Geography
- UGC NET Geography Topics
- Urban Systems
- Useful Links
- Water Resources
- About Me and This Site
Other Sites I Am Involved With