Why are the oldest continental rocks on the order of 4 billion years old?
What will be an ideal response?
Answer: Earth's age is 4.6 billion years. No rocks are as old as the Earth because of the recycling caused by plate tectonics. The oldest rocks are in small areas that have somehow not been subducted over or made into another type of rock by the rock cycle.
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The Soviet Union would have been more conveniently integrated if
A. it had adopted a democratic model of governance. B. population density in the hinterlands was greater. C. the major waterways flowed east instead of west. D. the major waterways flowed south instead of north.
Drought is ________ while aridity is ________
A) temporary; permanent B) persistent; seasonal C) normal; unusual D) predictable; variable
Another name for an infrared sensor is ____
a. thermistor b. radiosonde c. light thermometer d. radiometer e. thermocouple
Discuss the evolution of the hominids from the anthropoids What will be an ideal response?