Why do some asteroids leave the asteroid belt and cross the orbits of Earth and other solar system bodies?
A) The gravity of Earth and other bodies pull the asteroids out of the asteroid belt.
B) Asteroids collide in the asteroid belt and some asteroids are diverted into other orbits.
C) Comets passing through the asteroid belt pull asteroids away.
D) The asteroid belt is slowly expanding with time, into orbits of Earth and other bodies.
B
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Formaldehyde is an especially problematic indoor pollutant because it is
A. Highly carcinogenic B. Used in so many household materials C. Produced naturally by the earth below buildings D. Far more toxic than most other substances E. So difficult to detect
What is the age of the oldest evidence yet found with remnants of life?
a. 1.5 billion years old b. 2.7 million years old c. 3.85 billion years old d. 4.2 billion years old e. 6 million years old
Meteorology entered the space age on April 1, ________, when the first weather satellite was launched into space
A) 1980 B) 1920 C) 1945 D) 1960
The part of a plant that is best preserved and can most easily be used for climate reconstruction is:
A) the pollen. B) the root structure. C) the leaf vein. D) the flower.