How does ozone get into the stratosphere?
What will be an ideal response?
In natural conditions, ultraviolet radiation from the Sun has sufficient energy to
break the bonds of the oxygen molecules, and some "broken" molecules—oxygen
atoms—combine with ordinary oxygen too make ozone, O3.
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Sounds from musical instruments are produced by
A) vibrating strings. B) vibrating air columns. C) percussion. D) all of the above E) none of the above
What is the minimum about of time to achieve significant strength gains in a strength training program?
Where did Earth’s (interior) heat come from?
a. volcanoes b. accretion and differentiation as Earth formed c. radioactivity d. all of the above e. b and c
What would be different if this figure were drawn accurately to scale?
A) The dots that represent individual asteroids would have to be much smaller. B) The dots that represent individual asteroids would overlap each other. C) The dots should be farther from the Sun.