What formed the lunar maria?
a. ancient lava flows
b. Earth-moon collision
c. volcanic eruptions
d. erosion
e. tectonic plate movement
a
You might also like to view...
Radioactive Decay: Two radioactive isotopes, X and Y, both decay to stable products. The half-life of X is about a day, while that of Y is about a week. Suppose a radioactive sample consists of a mixture of these two nuclides. If the mixture is such that the activities arising from X and Y are initially equal, then a few days later the activity of the sample will be due
A. predominantly to Y. B. predominantly to X. C. entirely to Y. D. to X and Y equally.
Most stars on the main sequence fuse hydrogen into helium in their cores, but some do not
Indicate whether the statement is true or false
Two particles, each having a mass of 3.0 mg and having equal but opposite charges of magnitude of 6.0 nC, are released simultaneously from rest when they are a very large distance apart. What distance separates the two at the instant when each has a speed of 5.0 m/s?
a. 4.3 mm b. 8.6 mm c. 7.3 mm d. 5.6 mm e. 2.2 mm
The white light emitted by a fluorescent lamp is provided by the
A) mercury vapor in the lamp. B) phosphors on the inner surface of the lamp. C) high temperature of the glowing gas. D) filtering effect of the glass tubing.