What are the four characteristics that scientists use to classify stars? a. size, brightness, temperature, and composition b. size, distance away from us, temperature, and color c. location, distance away, color, and number of planets that orbit it d. heat, temperature, distance away, and size

Based on this map, which statement about africa’s economic activity is most accurate? a) coastal countries are all members of opec b) economic development is more common with opec nations c) coastal countries have more access to productive resources d) economic development is more common above the sahara desert

What was the great rift valley formed by

Scientists believe that differences in cause hot, plastic-like rock in the asthenosphere to rise toward earth's surface. a. density c. weight b. magnetism d. composition c. conduction. d. density.