Tropic maps are easily recognized by

a. colors

b. contour lines

c. physical features

d. symbols

What's erosion? a. the breakdown of rock into smaller pieces b. the removal of weathered products from rock c. a change in rock resulting from exposure to water d. a chemical change in rock that weakens it

According to the earth science reference tables, during which geologic time period were the continents of north america,south america, and africa closest together?

Scientists think that convection currents flow in earth’s a. continents. b. mantle. c. lithosphere. d. inner core.