The largest single air pollutant (in terms of the quantity emitted each year) is carbon monoxide
Indicate whether the statement is true or false
TRUE
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Distinguish between a mineral species and a mineral variety.
a. Mineral species differ from each other only in color, whereas mineral varieties differ from each other in color and internal structure. b. A mineral variety, which is a single type of mineral that varies due to the impurities that it contains, is a subsection within a mineral species, which is a collection of mineral specimens that exhibit similar internal structures and chemical compositions. c. Mineral varieties are assigned to mineral classes, whereas mineral species are subgroups of mineral varieties. d. Mineral species are differentiated solely by mineral composition, whereas mineral varieties are differentiated solely by mineral structure. e. A mineral species, which is a single type of mineral that varies due to the impurities that it contains, is a subsection within a mineral variety, which is a collection of mineral specimens that exhibit similar internal structures and chemical compositions.
The interaction between people and the wild plants and animals they eventually domesticated took place mainly in the well-watered Fertile Crescent, a vernacular region referring to an arc of land stretching from Israel to western Iran
a. True b. False Indicate whether the statement is true or false
Our alternating days and nights are caused by:
a. the rotation of Earth on its axis b. the revolution of Earth around the sun c. both the rotation and the revolution of Earth d. the distance of Earth from the sun
A stream generates its own floodplain by
A. sediment deposition during flooding. B. sediment deposition during meander migration. C. erosion during meander migration. D. All of the choices are correct.