Describe the content and physical structure of the soils that best fulfill the needs of most crop plants
What will be an ideal response?
"To support a good crop, the soil must (1) have a good supply of nutrients and a good nutrient-holding capacity; (2) allow infiltration, have a good water-holding capacity, and resist evaporative water loss; (3) have a porous structure that permits good aeration; (4) have a pH near neutral; and (5) have a low salt content. Moreover, these attributes must be sustained."
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The greatest nuclear catastrophe to date occurred in 1976, in a nuclear power plant at Verkoyansk, in central Siberia, Russia (which was, at that time, part of the Soviet Union)
Indicate whether the statement is true or false.
What is the only true, undistorted representation of Earth?
A. map B. satellite image C. globe D. remotely sensed image E. none of these
Which of the following does not correctly describe water in plants?
A) Water dissolves nutrients. B) Chemical reactions take place in water. C) Water carries away waste products. D) Water carries nutrients to all parts of plants. E) Water is created through the process of photosynthesis.
Channels on the surface of Mars may have been formed by
A. tectonics. B. wind. C. running water. D. collapse.