Seasons are caused by the earth's rotation around the sun and:
a. selective absorption by atmospheric gases
b. heat advection from the tropics.
c. the tilt of the earth's axis.
d. None of these choices.
c
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What characterized the Ordovician in terms of invertebrate life, and how does that relate to what was
happening geologically? What will be an ideal response?
Mercantile colonialism required huge migrations of people to extract the Earth's resources, including 30 million slaves and contracted workers from Africa, India, and China to work mines and plantations around the globe
a. True b. False Indicate whether the statement is true or false
Vegetative associations are called plant ____________________
Fill in the blank(s) with correct word
Atmospheric pressure is measured with a device called a ________
A) inclinometer B) theodolite C) anemometer D) thermometer E) barometer