A. Continental polar air mass C. Continental tropical air mass B. Maritime polar air mass D. Maritime tropical air mass

___ 1. Warm and humid air mass.
___ 2. Warm and dry air mass.
___ 3. Cold and dry air mass.
___ 4. Cold and humid air mass.
___5. Air mass coming from Canada
___6. Air mass coming from Mexico
___ 7. Air masses from the Pacific and Atlantic ocean close to the north pole.
___8. Air masses from the Pacific and Atlantic ocean close to the equator.

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POINT: 40
SCIENCE!

the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.

ionic bonds are two oppositely charged ions that attract. a sodium ion has a 1 positive charge; a chloride ion has a 1 negative charge. sodium and chloride have oppostive charged ions that attract which forms an ionic bond. a chemical bond formed when two atoms share electrons is called