What is an atom?
A)a negatively charged particle that circles a nucleus
B)a positively charged particle within a nucleus
C)the smallest particle into which an element can be divided while still retaining the chemical characteristics of that element
D)a combination of elements
E)a particle in the nucleus that has no charge
C
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What river has been a major supplier of commercial energy for decades in the region of southern Africa
A) Nile B) Niger C) Congo D) Limpopo E) Zambezi
South America's western deserts are not true deserts because they lie near the ocean. Indicate whether the statement is true or false
What does it mean when air is saturated?
Which of the following best describes melting of the mantle at subduction zones that leads to island arc volcanos?
A) Heat is carried downward with the subducting plate and melts the mantle above the downgoing plate. B) The subducting plate is heated as it is carried to depth and the subducted oceanic crust melts. C) Water released from the subducting plate decreases the melting temperature in the mantle above the downgoing plate to generate magmas from the overlying mantle wedge. D) The subducted plate subsides into the mantle and allows magma from the lower mantle magma ocean to rise toward the surface.