Which characteristic of Earth explains why Earth has the ozone necessary for an ultraviolet-absorbing stratosphere?
A) the existence of photosynthetic life
B) the existence of plate tectonics
C) the moderate surface temperature
D) the existence of oceans
A) the existence of photosynthetic life
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The agitation of atoms in a hot body creates a continuous spectrum of radiation
a. True b. False Indicate whether the statement is true or false
The type of EM radiation that has wavelength just a bit longer than that of visible light is __________
Fill in the blank(s) with correct word
A convex mirror has a focal length of ?20 cm. What is the object distance if the image distance is ?10 cm?
a. 10 cm b. 40 cm c. 60 cm d. 20 cm e. 30 cm
Relative to a stationary observer, a moving clock
A. always runs slower than normal. B. always runs faster than normal. C. keeps its normal time. D. Any of these choice could be correct depending on the relative velocity.