The predominant gas in the Earth's atmosphere is

a.

Helium

b.

Oxygen

c.

Methane

d.

Water vapor

e.

Nitrogen

In what way did soviet rule fail to live up to communist theory? A. control was held by the all people B. control was held by few people C. enough goods were made to sustain the country D. people were happy with the change

The epidemiologic transition is characterized by?

What evidence (3 types) did scientists use to prove continental drift? explain?

Pieces of ice that break off of a glacier and drift out to open sea are:

Which planet is approximately halfway between pluto's orbit and the sun?

Is Zika an epidemic or pandemic?

What is the most populous region of both the united states and canada

Name two factors that cause the pressure belts of the primary circulation patterns to break up into secondary wind regimes.

Brazil is home to 20 % of the known living species on earth

How many of the products or foods you use daily come from Asia's many resources, industries, and ecosystems? Give examples of