21-й – 30-й тесты. Английский язык. ЕГЭ, 2024. На базе материалов ФИПИ

When hot volcanic materials mix with water from streams or melted snow and ice, mudflows form. Mudflows have buried entire communities located near erupting volcanoes.

1. that resemble a jigsaw puzzle

2. when plates push together

3. until the gases escape violently and explode

4. that made life possible on our planet

5. because it is lighter than the solid rock around it

6. that doesn’t melt

7. when this type of magma erupts

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Kayak Adventure

It started with a casual phone call in the spring of 2005. A good friend, Mike Crenshaw, finally got a permit from the National Park Service to lead a private party of 16 boaters down the Colorado River. He had a slot open for Willie. Was he interested?

«It was the chance of a lifetime,» Stewart says. He had been waiting years for this trip to happen.

«How could I refuse?»

But before they shoved off, he had a couple of things to take care of. He had to get a white-water kayak, learn how to use it, and get a prosthesis to replace his missing arm.

The trip was still about four months off and Stewart figured he had time to master the needed skills for white-water kayaking. He spent hours practising in the university pool and in a creek down the road from his house. Over and over, he flipped himself upside down so he could work on his Eskimo roll in which he uses his paddle and a little hip action to flip himself upright.

Finally, figuring he was ready, Stewart headed for the Grand Canyon.

Even with all his training, he was barely prepared for the adventure. At the first significant rapids, a middling run of white water called Badger Creek, Stewart was thrown out of his boat. He recalls how demoralized he felt as he swam to shore. Farther downriver at a place called House Rock, he was knocked over four times.

He made it through mostly because he’d mastered one good move: the Eskimo roll.

At another set of rapids, Horn Creek, he got sucked into a violent implosion of water that held him in a swirling maelstrom for several terrifying seconds. At the next, Hance, which was full of rocks, Stewart says, «I was upside down, backward – basically, I was bounced down the river like a rubber ball.» He was figuratively, and literally, in over his head.