What are drylands? Where are they found? How important are they for human habitation and agriculture?
What will be an ideal response?
Drylands are arid, semiarid, and seasonally dry ecosystems. "Dryland ecosystems cover over one-third of Earth's land area. They are defined by precipitation, not temperature. Beyond the relatively uninhabited deserts, much of the land receives only 10 to 30 inches (25–75 cm) of rainfall a year, a minimal amount to support rangeland or nonirrigated cropland. These lands, occupying some 5.2 billion hectares, are home to more than 2 billion people and are found on every continent except Antarctica."
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The Cascade Mountains are part of a(n) ________ convergent boundary
Fill in the blank(s) with correct word
Which of the following does not result from increasing the temperature of a reaction?
A) A larger fraction of the collisions are effective collisions. B) The concentrations of the reactants are increased. C) There are more collisions. D) None, all of the above are a result of increasing the temperature.
The higher the ratio of oxygen-18 to oxygen-16 in the shells of organisms that lived in the sea during the geologic past, the ____ the climate at that time
a. ?colder b. ?warmer c. ?wetter d. ?drier e. ?more humid
Relying on natural predators to control pests is but one of many nonpesticide options farmers can use in an approach known as biological control.
Answer the following statement true (T) or false (F)