Which fossil fuel is the world's most abundant?
A. Crude oil.
B. Natural gas.
C. Biomass.
D. Coal.
E. Wood.
Answer: D
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Population declines among birds, especially long-distance migrant birds, have several primary causes. Which of the following causes is the exception?
A. habitat loss and fragmentation B. introduction of nonnative species C. collisions with power lines, towers, and skyscrapers D. intentional poisoning of food supplies E. climate change
Unconformities represent
A) a gap in the geologic record B) a time when the rock sequence was below sea level C) a period of igneous intrusion D) an example of the principle of superposition
Describe how Vladimir Putin has played a key role in consolidating Russia's power since 2000, both within the country and beyond
What will be an ideal response?
Which statement correctly describes rock-forming minerals and economic minerals?
a. Rock-forming minerals consist of a few types of minerals that are sparse in Earth's crust, whereas economic minerals are very abundant and are used extensively in the manufacture of products. b. Only minerals that are not rock-building minerals can have economic value. c. Silicates are important economic resources and include gypsum, which is used for plaster. Nonsilicate minerals are only important as rock-building minerals. d. Economic minerals consist mostly of silicate minerals, whereas rock-building minerals consist mostly of nonsilicates. e. Rock-forming minerals consist of a few types of minerals that are abundant in Earth's crust, whereas economic minerals are less abundant and are used extensively in the manufacture of products.