Thunder is caused by:
a. the collision between two thunderstorms with opposite electrical charge
b. the rapid heating of air surrounding a lightning channel
c. the explosion that occurs when + and - charge collide and neutralize each other
d. turbulent wind motions inside the thunderstorm
b
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An atom or group of atoms with one or more net positive or negative charges is called a(n) ____________________
Fill in the blanks with correct word
Concrete is formed by adding cement and water to a mixture of sand and gravel. This could be seen as an analog for the formation of what type of sedimentary rock?
A. Biochemical B. Chemical C. Clastic
The Monroe Doctrine and its Roosevelt Corollary were designed to justify US activities and interventions in Latin America. What are some of the historical and modern-day interests of the United States in this region?
During the earliest history of the earth, ________
A) the earth was cold and lacked any source of heat. B) the earth did not have any radioactive material C) the temperature increased so that iron and nickel melted D) almost all of the material was radioactive, and it decayed to the compositions we have today.