There is more than one type of crust on Earth. What are they? How do they differ?
What will be an ideal response?
Answer: The two kinds of crust that exist on Earth are oceanic crust and continental crust. Oceanic crust is found along the ocean floor as well as in mountain ranges. It is found in mountain ranges because of places where subduction zone processes pushed pieces of the seafloor onto the edges on continents, where it would later become embedded in mountain ranges. Oceanic and continental crusts vary in composition and thickness. While oceanic crust is typically around 7 kilometers thick, continental crust is typically about 25 kilometers thick. Continental crust is composed of quartz bearing igneous and metamorphic rocks while oceanic crust is composed of mafic igneous rocks. Both types of crust rest on top of the mantle.
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Channel beds and banks are made up of materials transported by streams, temporarily deposited, and then eroded again as streams take ________ courses
A) steep B) gentle C) meandering D) intermittent E) very fast
Photochemical smog differs from industrial smog in that it ________
A) consists of primary pollutants B) is formed only in the presence of sunlight C) has large quantities of soot D) is an unhealthy mixture of pollutants E) is primarily composed of carbon monoxide
Clouds
A) absorb longwave radiation from the Earth. B) emit longwave radiation toward the Earth. C) emit longwave radiation toward space. D) reflect solar radiation. E) all of the above
Rising and falling air currents, winds, and concentrations of CO2 and other greenhouse gases in the ____ play major roles in the planet's short-term weather and long-term climate.
A. troposphere B. thermosphere C. mesosphere D. stratosphere E. tropopause