Some graphics reproduced using Print Shop Deluxe, Broderbund
Software, Inc. All Rights Reserved used by permission. The Classroom does not claim
all descriptions of sites to be their own words. The Classroom makes no promises or representations about the gadgets on
this site as to quality. content or performance
The systematic study that organizes knowledge by
testable explanations and predictions of our
universe.
"In 2.3 billion years it will be too hot for
life to exist on Earth" Read More at
How it Works