Which is a major drawback to the use of hydrogen power?
A. The use of fossil fuels is required to create pure hydrogen.
B. Hydrogen may run out in the next 100 years.
C. Burning hydrogen releases greenhouse gases.
D. Hydrogen power creates toxic waste that must be stored forever.

What statistics are to determine the development of a nation?

Drastic boundary changes can occur for all of the following reasons except for a. a shift in the way a river flows b. the collapse of a government system c. a conflict between two neighboring groups d. one country's decision to sell land to another country select the best answer from the choices provide

Simple astronomical telescope the objective lens has a focal length of 75 cm and that of a piece of 5cm of the lenses are 18 cm apart when will be final image of a distant object before