The figure above shows an upper-level 500 mb weather map drawn over North America. In what upper-air weather system is the star located?

a. A trough.
b. A jet stream.
c. A ridge.


a. A trough.

Environmental & Atmospheric Sciences

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The Grenville orogen probably resulted from closure of a(n) __________, the final stage in a Wilson cycle

Fill in the blank(s) with correct word

Environmental & Atmospheric Sciences

A chemist has a sample which is known to be a solution. Which of the following might be used to separate the components of the solution?

A) distillation B) filtration C) either a or b D) neither a nor b

Environmental & Atmospheric Sciences

The north pole of a magnet

A. repels a north pole of another magnet. B. attracts a south pole of another magnet. C. both of these D. none of these

Environmental & Atmospheric Sciences

Solar system planets are classified as either ____________________ or ____________________ planets based upon

their chemical and physical properties. Fill in the blank(s) with the appropriate word(s).

Environmental & Atmospheric Sciences