We can observe some changes such as Earth quakes and volcanic eruptions on a human time scale, but many processes such as mountain building and plate movements take place over hundreds of millions of years.
(We; can observe; some changes such as Earth quakes and volcanic eruptions) (many processes such as mountain building and plate movements; take; place; T:over hundreds of millions of years)
We many processes such as mountain building and plate movements
can observe take
some changes such as Earth quakes and volcanic eruptions
place T:over hundreds of millions of years