The polar caps on Mars are composed of
A) pure solid carbon dioxide.
B) pure water ice.
C) mostly solid carbon dioxide and some water ice.
D) mostly water ice and some solid carbon dioxide.
E) There are no polar caps on Mars.
C
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The geologic time scale is broken up into time units of different sizes based on
A) eons, eras, periods, and epochs. B) changes in fossilization. C) visible and nonvisible life forms. D) major changes in life forms.
Imagine four equal positive charges, q, placed on points of a circle of radius r at the 3, 6, 9, and 12 o'clock positions. Coulomb's constant is k. The magnitude of the electric field at the center of the circle is given by
A. 4 kq/r. B. 4 kq/r2. C. kq/r2. D. kq/r. E. zero.
Answer the following statement(s) true (T) or false (F)
1. In example R9.3, the spaceship engines convert 60,000 kg of matter–antimatter fuel to massless light. The mass of the total system (empty spaceship plus flash of light, considered as a unit) thus decreases. 2. Mass is converted to energy in this process. 3. The total system’s mass decreases in this process. 4. Special relativity teaches us that energy is the same as mass.
What can be used to reconstruct the past vegetation of an area and infer environmental conditions
What will be an ideal response?