In terms of geologic time, when did humans appear on earth?

What are two types of downburts

In which type of economy do the forces of supply and demand typically drive prices?

Which of the following best describes the concept of federalism? A. power divided between state governments and the people. B. power divided between the House and the Senate. C. power divided between state and federal governments. D.

Volcano is a a) magma generated to the surface b) vent from which magma ascends c) formation of volcanic mountain

Which of the following cities was built around a myth? Troy Memphis Teotihuacan Babylon

The main plant adaptations in the tropical rainforest environment

1. What's the definition for ecological perspective 2. What the definition for spatial perspective

Which of the following terms describes a family structure headed by a woman?

Which of these is a renewable resource? a. coal b. cotton c. copper d. petroleum

What are the classifications for the six major land areas on earth?