Which of the following was an important heat source for melting of the primitive earth?
A. the "Big Bang" that started the universe
B. volcanic activity
C. collisions of infalling particles
D. heat energy radiated by the sun
Answer: C
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Which of the following materials will react with an acid to produce a gas?
A) NaOH(aq) B) Na2CO3(aq) C) both a and b D) neither a nor b
A 0.5-kg blob of silly putty moving at 2.0 m/s slams into a 4.0-kg blob of silly putty at rest. After sticking together the speed of the two blobs is about
A. 2.5 m/s. B. 1.5 m/s. C. 1.1 m/s. D. none of the above
The ________ forms the relatively cool, brittle plates of plate tectonics.
Fill in the blank(s) with correct word
An environmentally literate person will understand that our ____ are immense and are expanding rapidly.
A. natural resources B. hazardous waste materials C. ecological footprints D. food supplies E. sustainable resources