Why?
2006-08-21 14:43:57 · 16 answers · asked by Markster 2 in Politics & Government ➔ Military
The big bad wolf huffed and puffed and blew them down.
2006-08-29 07:15:25 · answer #1 · answered by *~HoNeYBeE~* 5 · 0⤊ 0⤋
There's several reasons, the most obvious being earthquakes and volcanoes but there are others...
The surface of the earth isn't solid, it's made up of a series of huge chucks of land called tectonic plates. Some of these are pulling apart from each other and are effectively tearing the earth apart - Africa's Rift Valley is one such example of a tear hundreds of miles long. In other places these plates are crashing into each other and forcing the land upwards - many mountain ranges are created this way (the Himalayas, Andes, Alps etc). This instability of the land can cause mountains to crumble.
Weather can have a dramatic effect over a period of time. The wind and rain can erode hillsides and cause crumbling. In places where the terrain consists of different rocks the erosion occurs at different rates with some rocks eroding quicker than others - this can lead to some fascinating geological formations (e.g. Badlands and Colorado).
In colder places the weather can induce a freeze-thaw cycle. Moisture gets into cracks in the rocks and when it freezes it expands and the crack gets bigger. This process is repeated many times until the rock splits into two.
2006-08-24 20:29:42 · answer #2 · answered by Trevor 7 · 1⤊ 0⤋
The surface of the earth isn't solid, it's made up of a series of huge chucks of land called tectonic plates. Some of these are pulling apart from each other and are effectively tearing the earth apart . That is why mountains crumble
2006-08-29 13:59:05 · answer #3 · answered by cyberfantoosh 2 · 1⤊ 0⤋
Gravity
2006-08-27 05:19:23 · answer #4 · answered by riommar73 3 · 1⤊ 0⤋
Erosion,Volcanos, Earthquakes,
2006-08-23 20:29:56 · answer #5 · answered by gorillaguth 3 · 2⤊ 0⤋
Tomahawk cruise missles slam into them at high velocity trying to root out Bin Laden!
2006-08-29 11:14:57 · answer #6 · answered by seadog0067 2 · 0⤊ 0⤋
Acid rain. Asinine reign.
2006-08-29 17:52:05 · answer #7 · answered by Grist 6 · 0⤊ 0⤋
Due to forces of geologic evolution such as wind and water over time.
2006-08-21 21:49:39 · answer #8 · answered by thexrayboy 3 · 2⤊ 0⤋
the mix of internal of the force deep in earth and external forces of wind and sand
2006-08-27 05:22:31 · answer #9 · answered by david w 5 · 0⤊ 1⤋
Goat droppings.
2006-08-21 21:52:13 · answer #10 · answered by Don 6 · 0⤊ 1⤋