Where are the two broad expanses of the Earth's youngest mountains (i.e., those that are younger than 100 million years)?
a. the Appalachians and the Andes
b. the circum-Pacific Mountain belt and the belt that extends eastward from the Alps all the way into southern Indonesia
c. the Appalachians and the Himalayas
d. the Andes and the circum-Pacific mountain belt
e. the circum-Pacific mountain belt and the Appalachians
b. the circum-Pacific Mountain belt and the belt that extends eastward from the Alps all the way into southern Indonesia
b. the circum-Pacific Mountain belt and the belt that extends eastward from the Alps all the way into southern Indonesia
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John Tuzo Wilson proposed a theory stating that the Earth's outer layer is made up of _____.
A ) a dozen separate plates B ) a thin layer of ancient soil C ) a dozen subduction zones D ) a dozen spreading centers
The Earth’s atmosphere became enriched in O2 during the ____
a. Devonian b. Cambrian c. Mesozoic d. Proterozoic e. Cenozoic
A simple bend or flexure in an otherwise horizontal rock layer is called a(n) ____________________. Fill in the blank(s) with the appropriate word(s)
Climate regions are separated on the Köppen climate classification map as an abrupt line. In reality, these are really zones of transition
a. True b. False Indicate whether the statement is true or false