Motion of the plates of Earth's crust is thought to be due to
a. the solar wind.
b. convection from the hot interior.
c. tides in the oceans.
d. friction between wind and the land surface.
e. Earth's magnetic field.
b
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Where do scientists find the key evidence linking the extinction of the dinosaurs to the impact of an asteroid or comet?
A. in sediments that surround a large crater in Mexico B. in sediments separating rocks from the time when dinosaurs existed from those deposited after dinosaurs were no longer found C. in rock brought up by drilling deep into Earth's mantle D. in sediments found on the ocean bottom near mid-ocean ridges E. in rocks returned from craters on the Moon
A long wire is known to have a radius greater than 4.0 mm and to carry a current uniformly distributed over its cross section. If the magnitude of the magnetic field is 0.285 mT at a point 4.0 mm from the axis of the wire and 0.200 mT at a point 10 mm from the axis, what is the radius of the wire?
A. 4.6 mm B. 7.1 mm C. 5.3 mm D. 12 mm E. 10 mm
Which of the following represents the shortest distance?
a. One parsec b. One astronomical unit c. One light-year d. One right ascension
Consider a situation where you carry a 20 N box up a flight of stairs, raising its elevation by 5 m. The work you do is __________
Fill in the blank(s) with correct word