Doomsday Asteroid
What happened 90 years (1908) ago in June in Siberia? ______
How many times greater was this impact than the bomb dropped on HiroshimaJapan? __
How many people would have died if this had occurred in New York City? ______
What did scientists find at the crash impact site?______
Comets and asteroids are remnants of the early ______(2 words).
Asteroids are rocky and found mainly in the ______belt.
Comets are icy and are found in the outer reaches of the ______Solar System.
Tiny fragments of asteroids are called ______.
Meteoroids enter the Earth’s atmosphere at about 40 times the speed of ______.
The theory that the Earth forms from gradual processes is called ______.
Did Uniformitarianism replace the theory of Catastrophism? ______.
What did a giant crater in Arizona turn out to be formed by? ______
What did scientist previously think craters on the Moon were formed by? ______
What actually formed the craters on the Moon? ______
What fills in the craters on Earth? ______
How many impact craters have been found on Earth? ______
What are the 2 “catastrophe machines” in our Solar System? ______
How many times longer did the Dinosaurs exist compared to Human existence? ______
Walter and Luis Alverez found a thin layer of iridium in rocks separating the time of the Dinosaurs from the time of the ______at 65 million years ago.
The rock that hit the Earth at the time of the Dinosaurs was about ______km in diameter and the energy released was equal to about all the nuclear weapons in the World.
The impact crater has been found off the coast of ______
The environmental devastation left ______of the Earth’s biomass burned and _____ of the Earth’s species disappeared forever.
We have not yet found ____ percent of all Earth crossing objects.
If we could light up all the Earth Crossing Objects in the night sky there would be ______of lights.
Do we currently have a defense against meteoroids? ______
President Reagan proposed a nuclear defense system called ______
For now, the best we can do is take pictures with ______of asteroids.
NASA is planning to send a satellite to the 22 mile long asteroid named ______
The Shoemakers observed a comet hitting ______in 1994.
The risk to an individual human of being hit by an asteroid is less/greater (circle one) than other natural disasters.
Do we have any means of predicting asteroid impacts? ______
The risk of being hit by an asteroid or comet is equal to the risk of dying in a ______crash.
At the very least we have the means to ______the sky to see if we or our children are at risk in the next century.