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this activity, Google Earth will be used to observe and measure some
real impact craters on the surface of the Earth. These craters vary in
size from small (a few hundred meters) to very large (over 100km).
In this activity you will be measuring craters of different sizes on
Earth which are the result of an impact from space. The impacts
causing these craters would result in a variety of
climatic changes - small impacts would generally affect only the local
area, whereas larger impacts could have massive changes in the global
To begin, download Google Earth, then follow the instructions below.
Finding and measuring impact craters
Find the following impact craters using Google Earth, pinpoint them and
measure their largest diameter (some of the craters are elliptical in
shape, not round).
Barringer Meteor Crater
This meteor crater was formed about 50,000 years ago by an iron meteorite impact and is very easy to find in Google Earth.
This impact crater is one of the oldest known craters on Earth.
It was formed about 200 million years ago, and although some of the crater has
been worn away by erosion, it is still very clear and easy to find in Google Earth.
Comparison with local distances