If a star is 300 light years away from Earth, how long does it take light from that star to reach Earth? A. 300 days
B. 300 hours
C. 300 years
D. 300 light years

About 3% of the water on earth is freshest. only about 40% of that freshwater is available for human use. why is so much freshwater unavailable for human use?

In order for a high temperature boiler or steam engine to produce superheated water, or steam: the heat source must be greater than 100°c the water must be permitted to evaporate quickly the system must be sealed and become pressurized above atmospheric pressure the vapor pressure must be kept below 760 mm(hg)

How many grams are in 1.75 mile of carbon