Which of the following forms at mid-ocean ridges?
a. island arcs
b. deep-sea trenches
c. guyots
d. new ocean floor

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

The economies of nordon could be described a. unable to use rich resources b. struggling but diverse c. dependent on one product d. healthy and diverse

Soil color only reflects the amount of organic matter present in soil.