as years, millions of them, go on, the earth evolves and changes drastically. in the future, the mountains in utah and allover the west coast will no longer exist. for example, the laurentian mountains (north of montreal), used to be as high as the rockies. through time, with the help of erosion, glacier weight and other factors, things shrink (or grow if theyre on a plate boundary).
we might be destroying our earth but in the end, it is capable of recovering, it just takes a long time.
on another note, all the carbon we're taking isn't just disappearing. the problem is, when we take carbon sediment from continental shelves, we're taking inactive carbon and making it active again. there is a certain balance the earth has, and unfortunately, we're making too much carbon active again which is helping with global problems. (insert global warming statement here)
one last thing.
in a diverging area such as an oceanic ridge, the farther away the region gets from the ridge, the colder it gets which makes it more dense. therefore, it becomes heavier and forces itself towards the earth core.
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