The Mohorovicic discontinuity was discovered by observing
A) earthquake movement at Earth's surface.
B) seismograms of an earthquake.
C) changes in rock density.
D) all of these
Answer: B
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Two long parallel wires are separated by 6.0 mm. The current in one of the wires is twice the other current. If the magnitude of the force on a 3.0-m length of one of the wires is equal to 8.0 ?N, what is the greater of the two currents?
A. 0.20 A B. 0.40 A C. 40 mA D. 20 mA E. 0.63 A
Photosynthetic life existing on a planet farther from the Sun than the Earth would most likely be
A) smaller, less efficient at collecting solar radiation or have a faster metabolism than photosynthetic life on Earth B) identical to photosynthetic life on Earth C) larger, more efficient at collecting solar radiation or have a slower metabolism than photosynthetic life on Earth D) impossible
Between July 1969 and December 1972, 17 people reached the surface of the Moon
a. True b. False Indicate whether the statement is true or false
Molecular clouds have "what it takes" which is:
A: lots of Hydrogen B: some Helium C: more than 100 times the mass of the Sun D: all of the above E: none of the above