Small glassy, translucent particles found in sediments and thought to be of extraterrestrial origin are called ________
a. turbidites
b. tektites
c. authigenic
d. oozes
b
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Farmers use alley cropping with row patterns nearly level around hills—not up and down—to dissuade soil erosion
Indicate whether the statement is true or false
If a fusion reaction produces no appreciable radioactive isotopes, why does a hydrogen bomb produce significant radioactive fallout?
A. The radioactive fallout is a result of the fission reaction used to ignite the thermonuclear fusion reaction. B. It is a misconception that fusion reactions produce no appreciable radioactive isotopes. Therefore, radioactive fallout is unavoidable. C. Once a hydrogen bomb is exploded, all matter within nearly 100 miles becomes radioactive fallout. D. The fallout is only the radioactive remnants of the bomb's structure and casing.
What are some of the reasons why running water is important to humans? What will be an ideal response?
Which plankton are considered microplankton?
A) Silicoflagellates B) Dinoflagellates C) Coccolithophores D) Cyanobacteria