(Not drawn to scale) Which spheres are zones of Earth's atmosphere?
1) lithosphere, hydrosphere, and troposphere
2) stratosphere, mesosphere, and thermosphere
3) asthenosphere, lithosphere, and hydrosphere
4) hydrosphere, troposphere, and stratosphere
20

What is one difference between austria and switzerland? a. austria is landlocked. b. austria has more minerals resources c. austria has a strong tourism industry d. austria has a strong dairy cattle industry

The graph below plots the temperature and luminosity of stars on the main sequence.

The us and canadian governments are doing all of the following to combat environmental problems except a. encouraging the use of public transportation b. enacting clean water policies c. requiring emissions testing d. limiting animal populations in some regions