How can planting the Acacia albida tree improve conditions in the Sahel region?
What will be an ideal response?
Answers might mention that it is leafless during the agricultural season, so does not compete with cultivated plants for light and moisture. During the dry season, it produces leaves that provide needed shade and shelter against wind erosion. The leaves it sheds add nitrogen and organic matter to the soil. Fuelwood, construction and fencing material, and medicinal substances are also derived from Acacia albida.
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The form of nitrogen that comprises 78% of atmospheric mass and is necessary for biological processes, but is unusable by plants, is
A) N2. B) NOx. C) N2O. D) NO2.
Differential pressure ____
A)produces similar features to lithostatic pressure but is a much longer process B)is always rotational C)cannot occur at the same time as lithostatic pressure D)is less transformational than lithostatic pressure E)typically occurs when two plates collide
The age of the oldest sediments recovered from deep-ocean drilling was ________
A) 300 million years ago B) 180 million years ago C) 65 million years ago D) 20 million years ago
Wood floats in water, 1 gram is defined as the mass of 1 cubic centimeter of water, a cubic centimeter of quartz weighs ~2.65 g and a cubic centimeter of galena weighs about 7.5 g. The density of these materials from highest to lowest is ________
A) galena, quartz, wood, water B) water, wood, quartz, galena C) wood, quartz, galena, water D) galena, quartz, water, wood