T h e mos t famous mass ertinction (绝) was 66 milli on years ago , when it's widely believ e d tha t a meteorit e (石) kill e d off th e dinosaur s. A 110-mile-wi d e crater in Merico with th e sam e geological ag e supports this theory .Believ e it or not ,...
What Crater is this?Dave Chapman
Dangers from outer space What is the greatest threat to life on our planet? Is it climate change? Shortages of food or water? Or might an altogether bigger danger come from somewhere further away: space?We're not talking about an attack by little green men here. Instead, how about(1)_...
Science Earth and Space Science Volcano What is a crater in a volcano?Question:What is a crater in a volcano?Volcanoes:Volcanoes occur due to tectonic activity on the Earth. As tectonic plates slide past each other, collide, or spread apart, magma from the mantle can escape to the ...
So we can’t use size to determine if a crater is the result of a primary impact or a secondary one. And of course impactors come in different sizes… though, actually, we think there are fewer small ones than there used to be. What really tells us more, though, is the arrangement,...
And the spot where the gravity readings are especially high...this is right in the middle of a 500-kilometer wide, circular ridge, what could be part of an old impact crater. And if there was an asteroid impact there in Wilkes Land, the next question is: did it happen 250 million yea...
In the chemical reactor there's a vacuum very close to that of interstellar space. And the temperature is minus 200° Celsius.在化学反应堆中有一个非常接近星际空间的真空空间。温度是- 200摄氏度。We made the ice, we can see a bit here, a sort of growth on the edge of the window. The ...
Work in a new group. This time, change roles. SCRIPT Narrator: A giant asteroid-15 kilometers wide-is moving toward Earth very fast. Over 65 million years ago, this asteroid crashed into the Earth near Chicxulub, Mexico. It made a very large crater. The asteroid caused the extinction of...
Where is the largest meteor crater in the U.S.? What is Charon in outer space? What asteroid belt is between Earth and the moon? How did the Copernicus crater form? Where is the largest meteor crater in the world? What is the Wetumpka impact crater?
North Pole. Using Polaris would not work in the southern hemisphere as you would not be able to see Polaris; there would be some other constellation or star on which to base your navigation. There is no southern pole star; the closest to that title is Polaris Australis. Ref:N.A.S.A ...