What are Apollo asteroids?
What will be an ideal response?
Asteroids whose orbit crosses ours, with perihelions of less than 1 A.U., but semimajor axes still more than 1 A.U. These are potentially the most dangerous of the Earth-Crossing bodies.
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What kind of light warms the stratosphere?
a. infrared b. visible c. ultraviolet
The force of kinetic friction between two surfaces is independent of the area of contact between the surfaces
Indicate whether the statement is true or false
As a liquid changes into a vapor ________
a. heat energy is absorbed b. heat energy is given off c. the temperature of the liquid rises substantially d. the specific heat maintains the temperature
An atom has subshells 
in the ground state. What is its atomic number?
A. 10 B. 18 C. 20 D. 30 E. More information is needed.