B is most likely the answer. Hope this helps.
Answer:
Hey! Here's your answer!
ROCKY MOUNTAINS: Laramide Orogeny (about 80 to 55 million years ago)
HIMALAYAS: Cenozoic Era (about 40 to 50 million years ago)
Explanation:
I HOPE THIS HELPS!
*let me know if its incorrect!*
<span> Valleys are one of the most common </span>land forms<span> on the surface of the planet. They are carved by flowing water or flowing ice slowly completing their sculpture new-born lakes at their feet, blue and green, free or encumbered with drifting icebergs </span>like<span> miniature Arctic </span>Oceans<span>, shining</span>
Answer:
plants did it
Explanation:
The development of organisms capable of photosynthesis caused Earth's atmospheric oxygen to increase. These organisms use carbon dioxide and water to form sugar and oxygen.
B. convergent <span> boundary of two continental crusts </span>