____________________ is an essential component of soil as it provides nutrients to plants and
increases the ability of the soil to retain ____________________. Fill in the blank(s) with the appropriate word(s).
Humus, moisture
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During the summer, which of the following regions would experience the greatest number of tornadoes?
A) Northern Great Plains B) Florida C) Gulf coast D) Southern Great Plains
What are the possible methods to alleviate the future mineral-resource shortages?
a. Increase or extend mineral supplies b. Explore marine mineral resources c. Conservation of mineral resources d. Develop new techniques that use fewer minerals e. Both a, b, and c
The speed with which an electromagnetic wave travels is its
A) plane of magnetic component. B) frequency. C) wavelength. D) amplitude.
Subtropical deserts have scanty, erratic precipitation because:
A) they are under persistent low pressure. B) there is no humidity to accompany the rising air at these latitudes. C) they are too far poleward to get rain from the ITCZ and too far equatorward to get rain from cyclonic storms. D) storm tracks are especially difficult to predict in this region.