Why are there seasons?
A. Insolation varies annually because of the Earth's rotational tilt.
B. The Sun's solar output increases and decreases on an annual cycle.
C. Earth gets closer and farther away from the Sun as it orbits annually.
Answer: A
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Which of the following properties most clearly reflects the internal arrangement of atoms in a crystalline material?
A) color B) cleavage C) luster D) specific gravity
According to the textbook, Africans comprise about 14 percent of the world's population but only consume ________ percent of the world's goods
A) 1 B) 2 C) 5 D) 8 E) 10
Which of the following is involved in making the DNA less dense and more accessible?
A) acetylase B) helicase C) binding proteins D) polymerases
What often produces colorful precipitated minerals because of improved solution properties and large mineral content?
A. saltwater bodies B. hot springs C. dolomite formations D. volcanoes E. artesian cold springs