The universe is 14 billion years old. If the universe is not expanding, how long will it be until a galaxy 17 billion light-years away is at the edge of our observable universe?


Ans: 3 billion years

Environmental & Atmospheric Sciences

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A ____________________ is a chemical used to control or kill populations of organisms that we consider undesirable such as insects, weeds, or rodents.

Fill in the blank(s) with the appropriate word(s).

Environmental & Atmospheric Sciences

If we compress a thin layer and a thick layer so that they start buckling, which layer do you think starts to buckle first?

What will be an ideal response?

Environmental & Atmospheric Sciences

Mutations involve some kind of change in _____

A)species B)chromosomes C)alleles D)offspring E)populations

Environmental & Atmospheric Sciences

What do the solid particles of a stream include?

A)bed load only B)suspended load only C)solution load only D)bed load and suspended load E)suspended load and solution load

Environmental & Atmospheric Sciences