2006-12-14 23:01:49 · 7 answers · asked by . 2 in Science & Mathematics ➔ Geography
The birth of the Appalachian ranges, some 680 million years ago, marks the first of several mountain building plate collisions that culminated in the construction of the supercontinent Pangea with the Appalachians near the center
The younger ranges of the Rocky Mountains uplifted during the late Cretaceous period (100 million-65 million years ago), although some portions of the southern mountains date from uplifts during the Precambrian (3,980 million-600 million years ago).
Thus the Appalachian ranges are older than the rockies.
2006-12-14 23:24:50 · answer #1 · answered by Som™ 6 · 4⤊ 0⤋
The Appalchians are millions of years older than the Rockies. You can tell because while the Rockies are taller and have more jagged peaks, the Appalachians are shorter and have softer peaks. This is because the Appalachians have been weathering and eroding far longer than the Rockies. Also, the Rockies are still being forced upward by tectonic plate movement, while the Appalachians stopped rising long ago.
2006-12-15 10:45:22 · answer #2 · answered by Anonymous · 0⤊ 1⤋
Appalachians. The Appalachian Mountains are older than the Rockies because they are not as high as the rocky mountains. Therefore, the Appalachians are older because they have had more time to erode.
2016-05-24 19:33:16 · answer #3 · answered by ? 4 · 0⤊ 0⤋
Appalachians are far older. Rockies are relatively newbies.
2006-12-15 02:32:23 · answer #4 · answered by Anonymous · 0⤊ 1⤋
the Applachian mountains are older. They were 'ground down' by the previous ice ages.
2006-12-14 23:09:35 · answer #5 · answered by words_smith_4u 6 · 1⤊ 1⤋
they're both WAY older than you and I or even our great grandparents, I'll tell you that
2006-12-18 09:51:26 · answer #6 · answered by Anonymous · 0⤊ 0⤋
appalachias
2006-12-15 06:50:59 · answer #7 · answered by Anonymous · 0⤊ 1⤋