The principle of original horizontality states that each
A) sedimentary layer is older than the layer above.
B) sedimentary layer is younger than the layer above.
C) new layer of sediment is laid down nearly horizontally over older sediment.
D) new layer of sediment is laid down accordingly.
Answer: C
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When U-238 emits an alpha particle, the resulting nucleus has
A) 90 protons. B) 91 protons. C) 92 protons. D) 93 protons. E) 94 protons.
A proton and a deuteron are moving with equal velocities perpendicular to a uniform magnetic field. A deuteron has the same charge as the proton but has twice its mass. The ratio of the acceleration of the deuteron to that of the proton is:
a. 1. b. 2. c. 0.5. d. There is no acceleration in this case.
Why has NASA sent recent orbiters to Mars on trajectories that required them to skim through Mars's atmosphere ("aerobraking") before settling into their final orbits?
A) It saved money because the spacecraft used atmospheric drag to slow down rather than needing to carry enough fuel to slow by firing rocket engines. B) It allowed the orbiters to get higher resolution pictures of the surface as it came close when skimming through the atmosphere. C) It allowed the spacecraft to collect samples of the atmospheric gas for return to Earth. D) Each spacecraft also carried a lander, and the lander could only be dropped to the Martian surface when the spacecraft passed through the atmosphere.
The Declaration of Principles Concerning Activities Following the Detection of Extraterrestrial Intelligence states that the first thing to do after the detection of a possible signal is to
A) send a reply B) announce the discovery to the public C) confirm that it is genuine D) classify it top secret