Earth's atmosphere became oxygen rich about 2.45 ________ years ago

A) billion
B) million
C) trillion
D) thousand


A

Environmental & Atmospheric Sciences

You might also like to view...

Vertical ocean circulation is the result of differences in what between adjacent water masses?

a. temperature b. salinity c. Coriolis effect d. temperature and salinity

Environmental & Atmospheric Sciences

How do paleontologists deal with the incomplete nature of the fossil record to establish a geologic history of biodiversity changes?

What will be an ideal response?

Environmental & Atmospheric Sciences

Eastern North American areas such as Missouri are at risk of suffering _______________ earthquakes

Indicate whether this statement is true or false.

Environmental & Atmospheric Sciences

Develop a plan for opening a single new coal mine in Australia for export. Where would you open the mine? What challenges would you face?

What will be an ideal response?

Environmental & Atmospheric Sciences