In what part of Earth's atmosphere do we live?
a) the heterosphere
b) the stratosphere
c) the ionosphere
d) the troposphere
d
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Estimation: A reasonable estimate for the height of the walls in an ordinary American home is
A. 10 m. B. 8 m. C. 2.5 m. D. 1.5 m.
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
Ernest Rutherford's experiments in which alpha rays pass through a thin piece of metal foil demonstrated that
A) light is a wave. B) electrons exist. C) the atom contains a tiny nucleus containing most of the atom's mass. D) light is made of particles. E) neutrons exist.
A laser can be used for very accurate measurements of distances between objects
Indicate whether the statement is true or false