State the name of the radioactive isotope that has a half-life that is approximately the same as the estimated time of the origin of earth.

Which of the following statements about geographers' perceptions and perspectives is false? a. geographers avoid looking at the world with different perspectives. b. regions are a relative thing and a matter of perception. c. spatial distribution can be a matter of perception. d. mental maps are a way that people memorize and perceive the world around them. select the best answer from the choices provided. a b c d

Compounds which are found naturally in the earth are called: a. ores b. composites c. rocks d.minerals

Which of the following is a way that advancements in technology improve humans' ability to measure air quality and protect human health?