What is the lithosphere?
a. another name for a planet’s crust
b. the crust plus the mantle
c. a relatively rigid outer layer of rock that lies above less rigid rock below
d. the boundary between the core and mantle
Answer : c. a relatively rigid outer layer of rock that lies above less rigid rock below
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A car travels in a due northerly direction at a speed of 55 km/h. The traces of rain on the side windows of the car make an angle of 60 degrees with respect to the horizontal. If the rain is falling vertically with respect to the Earth, what is the speed of the rain with respect to the Earth?
A. 48 km/h B. 95 km/h C. 58 km/h D. 32 km/h E. 80 km/h
Which of the following is not a piece of evidence supporting the conclusion that active galactic nuclei are powered by accretion disks around massive black holes?
A) The total amount of radiation coming from the galactic center can, in some cases, exceed 100 times the total luminosity of the Milky Way Galaxy. B) Infrared observations show that many stars are forming near the centers of active galaxies. C) Observed radiation from the galactic center can vary significantly in brightness in times as short as a few days. D) Spectral lines from the galactic center indicate that clouds of gas are orbiting a central object at very high speed. E) Radio observations sometimes show long jets of material that can extend millions of light-years out from the galactic center.
The instability of uranium-235 compared to uranium-238, along with the relative stability of hydrogen compared to tritium, shows that the stability of a given nucleus depends upon
A. adding or subtracting neutrons, which can change a stable isotope into an unstable isotope. B. the number of electrons in the nucleus. C. the mass: heavier nuclei are always less stable. D. the speed of electrons orbiting the nucleus: more mass means more gravitational pull.