Reservoirs behind dams eventually fill with sediment that the water naturally would have transported downstream
a. True
b. False
Indicate whether the statement is true or false
True
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Which of the following statements accurately describes the components of an atom?
a) Protons, which have a positive charge, and neutrons, which have a negative charge, occupy the nucleus. Electrons with no charge orbit the nucleus in shells b) Protons, which have no charge, occupy the nucleus. Positively charged neutrons and negatively charged electrons orbit the nucleus in shells. c) Neutrons, which have no charge, occupy the nucleus. Positively charged protons and negatively charged electrons orbit the nucleus in shells. d) Protons, which have a positive charge, and electrons, which have a negative charge, occupy the nucleus. Neutrons with no charge orbit the nucleus in shells. e) Protons, which have a positive charge, and neutrons, which have no charge, occupy the nucleus. Negatively charged electrons orbit the nucleus in shells.
What does the HDI (Human Development Index) measure?
a) The gross national and gross domestic products b) Physiological growth rates of impoverished children c) The extent of human misery that results from poverty and environmental problems d) Quality of life indicators such as literacy, life expectancy, standard of living and purchasing power
Steppe soils are usually low in organic matter
Indicate whether the statement is true or false
Which of the following are pioneer species on recently glaciated rock?
A) evergreens and fir trees B) spruce and fir trees C) lichens and mosses D) maples and redwoods E) herbs and shrubs