Measurements of the ice temperature far below the South Pole suggest that a so-called ¨lake¨ discovered at the base of the ice is most likely permafrost - a frozen mixture of dirt and ice - because the temperature is too low for liquid water.
Far from being a disappointment, says a University of California, Berkeley physicist, the permafrost subglacial lake may be ideal for developing and testing sterile drilling techniques needed before scientists attempt to punch through the ice into pristine liquid lakes elsewhere in Antarctica in search of exotic microbes.
UC Berkeley Press Release June 28, 2002
Scientists digging south of Denver say they have uncovered evidence of a lush and vibrant rainforest that emerged surprisingly soon after the asteroid collision that wiped out the dinosaurs 65 million years ago.[CNN News]
Here is an interesting website. http://www.lpl.arizona.edu/impacteffects/ will calculate the effects of an asteroid or comet crashing to the Earth. It is an interactive page enabling you to input your own data. Try seeing what size crater would form from a direct impact on your nearest town, or a natural feature close to you.
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