The main layers of the Earth in correct order, from the surface moving down is:
a) upper core, outer core, inner core, mantle
b) outer core, inner core, upper mantle, lower crust
c) crust, mantle, outer core, inner core
d) upper mantle, lower mantle, inner core, crust
Answer: c) crust, mantle, outer core, inner core
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What is a common approach used to deal with collapsible soil when constructing water canals?
a. Waterproof it with an impermeable barrier. b. Remove all of it and replace it with an engineered fill. c. Precollapse it by soaking it with water. d. Use a reinforced concrete lining for the canal. e. Extend sections of very large diameter pipe through these areas.
There is good evidence that variation in solar energy, as evinced by sunspot activity cycles, is responsible for short-term climatic variations
Indicate whether the statement is true or false
Cones and cockpit karst develop in
A) cold, midlatitude climates. B) arid regions. C) polar regions. D) wet tropical areas.
All of the following are allowed in marine protected areas EXCEPT ________
A) the laying of fiber-optic cables B) the installation of oil pipelines C) oil drilling D) the harvesting of kelp E) fishing