Chloropleth Map

http://water.usgs.gov/watuse/wumaps.color.html

Chloropleth maps show statistics through different shades of color on a map. This map is showing how many million gallons of water each state uses. Blue is the least and red is the most.

Hypsometric Map

http://serc.carleton.edu/quantskills/methods/quantlit/cumperc.html

A hypsometric map is a measurement of how high or low something is with images and colors. In this map the highest points, mountains, are all in blue.

Mental Map

http://fasica.altervista.org/adam/adam_en.htm 

A mental map is what someone can picture in their mind to come with things like directions somewhere or drawing a map of somewhere they've been, or drawing a picture of something they've seen.