The hobby–eberly telescope has a diameter of 9.2 m. the hale telescope has a 5.1 m diameter. how many times larger is the light‑gathering power of the hobby–eberly telescope compared to the hale telescope?

Where does the availability of water pose the greatest problem

Which of the following is not a challenge to instituting sound global environmental policies? a. most changes are inexpensive and easy to implement. b. elected leaders who support unpopular environmental issues often are not re-elected. c. economic considerations outweigh environmental ones in many societies. d. there is no way to enforce international environmental agreements.

Which of the following best describes brazil's economy from 1650-1880? a. it gradually shifted to manufacturing as the industrial revolution progressed. b. it was based on mining. c. it was based on plantation agriculture, where slaves served as a labor force. d. it was based on small, family-owned farms.