What type of atom is represented by the small brown sphere in the center of this silica tetrahedron?
A. silicon
B. sulfur
C. chlorine
D. iron
E. aluminum
Answer: A
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A cross section of Earth reveals a layered structure that has different thicknesses and densities. How do geologists know this?
A) from drilling and digging down into the various layers B) from observing the characteristics of lava and gas issuing from volcanic vents C) from observing the transit times through Earth of seismic waves generated by earthquakes D) from comparisons with drill cores taken by robot spacecraft on Mars and Venus
Describe how deforestation affects the concentration of CO2 in the earth's atmosphere
Which of the following is a characteristic of commercial agriculture?
A) Most of the production is sold to companies that process the food and sell it to consumers. B) The farmer depends on his or her own production for most food. C) Technology is low. D) A great deal of human labor goes into farming.
Water covers approximately ____ of the surface of Earth
a. 25% b. 5% c. 50% d. 71% e. 95%