Which of the following substances is pure?
A. an element
B. an ionic compound consisting of sodium and chlorine ions
C. a covalent compound consisting of one type of molecule
D. all of the above
E. none of the above
Answer: D
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Human activities that can significantly contribute to shoreline erosion include ____
A) building sand dunes near the backshore to protect property B) importing sand to beaches from offshore C) placement of seawalls along the shoreline D) excess fishing and boating activities
Most metals, such as iron and copper, do not occur in a pure state in Earth's crust, but occur within ________
A) ores B) sediments C) igneous rocks D) the O horizon of the soil E) organic materials
Briefly list and describe the stages of the demographic transition model
What will be an ideal response?
What is a population pyramid?
What will be an ideal response?