Describe how radar images are obtained and the types of information they give
What will be an ideal response?
Answer: Radar observes the internal cloud conditions by measuring the amount of radiation backscattered by precipitation (both liquid and solid). A transmitter sends out brief pulses of electromagnetic energy with wavelengths on the order of several centimeters. A receiver records the intensity of the echoed pulses (indicative of the number and size of droplets and crystals) and the time elapsed between pulse transmission and return (which indicates the distance to the scattering agent).
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Explain why lack of diversity in food crops might present problems for the world food supply
What will be an ideal response?
Which of the following describes the degree to which geologic processes have concentrated a mineral resource above its average concentration in Earth's crust?
A. enrichment factor B. geologic factor C. concentration level D. relative abundance E. economic potential
________ and nickel are thought to comprise significant portions of the Earth's inner and outer cores
A) Aluminum B) Quartz C) Basalt D) Iron E) Titanium
The rock record for tens of millions of years indicates that the Earth's magnetic field ________.
A. reverses polarity about every 500,000 years B. did not come into existence until about 1 million years ago C. is constant in strength and polarity D. is a monopole magnet E. has steadily weakened and will be gone in another 10 million years