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do some folded mountains fold downward?

When two plates of equal weight push against one another, they can form folded mountains. They fold upward. Why couldn't they just as easily fold downward? Please forgive my ignorance and stupidity. :(

Answers (4)

bd5uberwaa profile image
fdqcwh41aa profile image

They do. Check out the geology of valley and ridge provinces, in particular the Appalachian Mountains. They are basically a series of anticlines (upward fold) and synclines (downward fold).

Reference: Geologist

lmn5qo8saa profile image

Path of least resistance, air is much less dense than the mantle so when the 2 plates collide they move up.

ebxmitf8aa profile image

They do. Fold both upward and downward, that is. You basically need just as much crust below as there is mountain above (to balance the weight of the mountain.) A bit like an iceberg, if you like, because the crust is "floating" in the mantle (but the densities of water and ice are nearly the same, so relatively speaking much more of the iceberg is submerged.)

"The processes of orogeny can take tens of millions of years and build mountains from plains or the ocean floor. The topographic height of orogenic mountains is related to the principle of isostasy,[6] that is, a balance of the downward gravitational force upon an upthrust mountain range (composed of light, continental crust material) and the buoyant upward forces exerted by the dense underlying mantle.[7]" (See references below).

{No-one is dumb for seeking knowledge. You are not born with it. Dumb is refusing to seek answers, or rejecting them when you don't like them.}