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C, D

Explanation:

The population of Australia is most dense in the South Eastern region.

The Ring of Fire is known for it's active volcanoes and frequent earthquakes.

I hope this helps you!

i am a little confused myself with what goes with the letters and what goes with the numbers but ill do my best to you

the cordillera states and grand canyon are along the southwest u.s. and northern mexican pacific.

the great plains and southwest desert are also the prairie and home to many earthquakes too .

the coastal plains have poor soil and many factories started in the south.

is this what u needed? if not i can see what i can do

answer; the correct answer is chemical: