In the Northern Hemisphere, we call the green-yellow light show observed in the sky the ____________________; its counterpart in the Southern Hemisphere is the ____________________
Fill in the blank with correct word.
ANSWER: aurora borealis; aurora australis
northern lights; southern lights
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The sediment found in the Mississippi River Delta is an example of _______
A. lithogenous sediment B. biogenous sediment C. hydrogenous sediment D. terrigenous sediment
Cyclogenesis is the __________ of a mid-latitude cyclone
a. development or strengthening b. weakening or dissipation c. term for the exact midpoint d. none of the above
The Amargosa Valley in eastern California desert often experiences a cold evening wind that blows downvalley. Which of the following might explain this phenomenon?
A) Moist Pacific air rising over the Sierra Nevada Mountains produces mountain precipitation, and as this air spills off the eastern escarpment, it forms the valley wind. B) Daytime heating causes a local low pressure that causes air to rush in by evening. C) Night time cooling upvalley produces a cold, unstable air mass that is funneled down the valley to produce a valley wind. D) It is a nighttime land breeze and there should be an accompanying daytime seabreeze up valley.
When atmospheric CO2 concentrations reach ________, scientists believe a possible climatic threshold in which Earth systems could transition in a chaotic mode will be reached
A) 300 ppm B) 350 ppm C) 400 ppm D) 450 ppm E) 500 ppm