At the ends and along the sides of a glacier, the sediment deposits may form ridges known as
a. deltas.
b. levees.
c. drifts.
d. moraines.
d
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Convection is important in stars because it
a. increases the temperature of the star. b. mixes the gases of the star. c. transports energy outward in the star. d. carries the neutrinos to the surface of the star where they can escape. e. mixes the gases of the star and transports the energy outward in the star.
Radioactivity Basics: Polonium-216 decays to lead-212 by emitting what kind of nuclear radiation?
A. alpha B. beta-minus C. beta-plus D. gamma E. x-rays.
A cup of coffee is enclosed on all sides in an insulated container 1/2 cm thick in the shape of a cube 10 cm on a side. The temperature of the coffee is 95°C, and the temperature of the surroundings is 21°C. Find the rate of heat loss (in J/s) due to conduction if the thermal conductivity of the cup is 2 × 10^?4 cal/s/cm/°C
a. 62 b. 74 c. 230 d. 160 e. 12
Suppose the room in which you are sitting was magically transported off the Earth, and sent accelerating through the universe at 9.8 m/s2. Assuming your doors and windows are sealed and closed, how could you tell that you'd left the Earth?
A) You couldn't; the equivalence principle tells us that you won't be able to tell the difference. B) You would weigh more than you do on Earth. C) Your time would run slower than it does on Earth. D) You'd hear a loud whooshing sound as you careened through space.