Which statement is true about the use of radiation to treat cancer? a) only weak x-rays can be usedb) only powerful x-rays can be usedc) only beta particles can be usedd) only alpha particles can be used.

altitude, density, pressure

air gets less dense the higher the altitude and also the air pressure is less as altitude rises.

the answer to your question is c.

if you read the house of usher you should know that the house was haunted

space exploration has led to the development and technological improvement of many everyday items. (if this answer is wrong i will find the right answer) : )

it's all four options.