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
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
What are radioactive isotopes, and why are they important to geologists? What will be an ideal response?