Sources of heat in the early earth included
A. the impact of colliding particles as they came together to form the earth.
B. decay of radioactive elements.
C. compression by gravity.
D. All of the choices are correct.
Answer: D
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Which policy is used in the U.S. with regard to the manufacture and sale of new chemicals?
A. Chemicals are assumed to be safe until substantial evidence to the contrary is proven. B. The chemical company must present overwhelming evidence that the chemical will do no harm. C. Chemicals are assumed to be dangerous until substantial evidence to the contrary is proven. D. Chemical manufacturers have enthusiastically supported laws that protect people over chemicals.
Which of the following is least likely to be mapped with data about ancient igneous rocks?
A) ancient hot spots B) ancient convergent zones C) ancient mountain ranges D) ancient divergent zones
Antecedent streams can flow through a mountain range because _____
a. extreme flow velocities allowed them to flow over the top of the mountains b. bedrock solution gradually opens a tunnel through the mountains that collapses c. headward erosion connects two streams on opposite sides of the mountains d. the gap in the mountains existed before the stream flowed through it e. the stream existed before the establishment of the mountains
Which of the following carries cholesterol to the cells?
A) chylomicrons B) HDL C) LDL D) VLDL