An important part of the history of our understanding of the atmospheric ozone layer was
A) satellite measurements that showed a dangerous build-up of ozone all over Earth.
B) the discovery by Rowland and Molina that jet airplane exhaust is contributing to the greenhouse effect.
C) the discovery by Susan Solomon that jet airplane exhaust is contributing to the greenhouse effect.
D) the discovery by Rowland and Molina of a large ozone depletion over Antarctica.
E) the discovery by Susan Solomon of a large ozone depletion over Antarctica.
E
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S0 galaxies have spiral arms, but little to no gas and dust. This is believed to happen because ____
a. their gas has been cannibalized by other galaxies b. they have had bursts of star formation during major collision the gas and dust formed new stars c. starburst events have used up all of the gas and dust in the disk d. gas and dust have been stripped from the galaxies as they pass through hot, intergalactic gas e. tidal interactions have forced the gas into the central bulge
What is the maximum number of 100-W lightbulbs you can connect in parallel in a 120-V home circuit without tripping the 20-A circuit breaker?
When a negatively charged balloon is placed against a non-conducting wall, negative charges in the wall are what?
As a spaceship is moving toward Earth, an Earthling measures its length to be 325 m, while the captain on board radios that her spaceship's length is 1150 m. (c = 3.00 × 108 m/s)
(a) How fast is the rocket moving relative to Earth? (b) What is the TOTAL energy of a 75.0-kg crewman as measured by (i) the captain in the rocket and (ii) the Earthling?