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呵呵~~答案就在"It's this rolling terrain that the landscape look like in the aftermath of the mountain building event that ended about 50 million years ago."看看在文中的哪里？仅供参考！
n. 根据，证据
v. 证实，证明
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- Seventy million years ago, a great inland sea disappeared and the Rocky Mountains emerged from the seafloor.
- Sixty million years ago, they reached their peak height, twice what it is today.
- Then for millions of years, the Rockies slowly eroded away to half their original height until 3 million years ago,
- another dramatic chapter in their story began that would transform them into the Mountains we know today.
- Geologist and photographer Bob Anderson takes to the air.
- He is looking for clues that will tell him how the Mountains have evolved.
- First he flies over Boulder Canyon in the Colorado Rockies.
- It is an area that has remained almost unchanged over millions of years.
- " So this is Boulder Canyon we are flying up right now. And you can see how the river has in size maybe a few hundred feet down into otherwise relatively rolling terrain.
- " The mountain peaks that existed on the young Rocky Mountains were rounded off as rivers and streams eroded the rock.
- " It's this rolling terrain that the landscape look like in the aftermath of the mountain building event that ended about 50 million years ago.
- " But as Anderson climbs higher to Longs Peak in the Rocky Mountain National Park, the terrain changes.
- Instead of rolling hills, there are rugged mountains with steep and jagged cliffs.
- It's evidence that another force has been at work.
- The most famous of these cliffs is the Diamond.
- Named for its shape, it's a vertical wall with a sheer 900 foot drop.
- The summit about 45,000 square feet is the same size as a football field.
- " Well, we are flying beside, ur, Longs Peak, one of the biggest climbing challenges in the Rockies.
- For a century, it's been a climbing Mecca. It's a gorgeous, intact piece of rock.
- " This awesome wall is the most difficult climb in the whole of the Rockies.
- And since it was officially open to climbers in 1960, has claimed over 50 lives.
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