44题答案:C细节题,根据文中的第五段There are more than 1,500 active volcanoes in the world.A volcano is considered active if it has erupted in the last 10,000 years.可知 一个活跃的火山可能在过去的10000年爆发,故答案是C.45题答案:B主旨题,根据文中的大意主要围绕火山进行描述的,故答案是B. ...
It cannot be ruled out, nor predicted that there will be another super-volcano eruption at Yellowstone in some (geologic) future. In recent years, the caldera has been studied and is being monitored more closely. In recent years, Yellowstone has been showing unrest in the form of deformation...
There are more than 1,500active volcanoes in the world.A volcano is considered active if it has erupted in the last 10,000years.In ancient times,more than 80percent of the earth's surface was volcanic.Volcanic eruptions formed the sea floor and some mountains over many years.Gas from ...
volcanoes 53.According to Paragraph 2,a volcano will probably erupt if . A.it has a history of about 640,000years B.its floor has been rising for a few years C.it has erupted three times in history D.its floor goes down three inches each year 54.Which of the following statements is...
As for the Yellowstone supervolcano, the last time it erupted was 630,000 years ago. What Would Happen If An Asteroid Hits Yellowstone Volcano? And while it's relatively a quiet area with a few recorded seismic activities here and there (it is, after all, the site of a supervolcano), (...
The park is the most special because it sits on the top of an ancient super volcano (火山) —the Yellowstone Caldera.And it is an active volcano.It is believed that the last time the volcano erupted (爆发) was one half million years ago.Experts say it may erupt again in another 1,...
Visitors may not realize it, but Yellowstone is situated directly above one of the largest volcanic systems on Earth - a supervolcano. For the past two million years, this volcano has erupted roughly every 600,000 years. The last major eruption, which produced a caldera that stretches 80 kilo...
What happens immediately before a volcano erupts? What happens to lava after it erupts from a volcano? What happens when a composite volcano erupts? What would happen if the Yosemite volcano erupted? How does a supervolcano erupt? What happens when a shield volcano erupts? What heats the geyser...
Last Saturday, California Volcano Observatory released a statement saying that a magnitude 5.4 earthquake (an aftershock of the 7.1 event) had triggered an earthquake swarm at the Coso Volcanic Field. However, the volcano alert level was kept at normal and it said there “is no imminent threat ...
There are more than 1,500active volcanoes in the world.A volcano is considered active if it has erupted in the last 10,000years.In ancient times,more than 80percent of the earth's surface was volcanic.Volcanic eruptions formed the sea floor and some mountains over many years.Gas from ...