The average number of people per unit area is the ________ ________
Fill in the blank(s) with correct word
population density
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Lava rocks formed less than 800,000 years ago are found to have a different _____ than lava rocks formed over 1.5 million years ago.
A ) magnetic polarity B ) mineral composition C ) magnetic strength D ) precious metal content
What are radioactive isotopes, and why are they important to geologists? What will be an ideal response?
A(n) ____________________ is a trough-shaped, weak, low-pressure system that progresses slowly westward in the trade-wind belt of the tropics
Fill in the blank(s) with correct word
Which one of the following applies to a valley glacier that lengthens (extends the position of its terminus downslope) over a period of many years?
A) wastage exceeds accumulation B) accumulation and wastage are about equal C) accumulation exceeds wastage D) none of the above