020 WGEO FINAL EXAM uiz is accepting submissions until Thursday, December 17, 2020 at 10:15 am Question 10 of 50 | Page 10 of 50 Show instructions Question 10 The line of latitude at 60° 30'N that marks the boundary of the northern polar zone. Arctic Circle о а Ob Northern Polar Circle ос Southern Polar Circle Od Antarctic Circle Next Page Back

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.

One of the brightest comets of the 20th century was comet hyakutake, which passed close to the sun in early 1996. the orbital period of this comet is estimated to be about 30,000 years. find the semi-major axis of this comet’s orbit. compare it to the average sun-pluto distance and to the distance to alpha centauri, the nearest star to the sun, which is 4.3 light-years distant.

According ti the following map, what are the most common mineral resources found in the united states?