Frequent earthquakes, offshore trenches, and active volcanoes perched on top of older rock are all indications of ________.
A. Precambrian shield
B. active mountain ranges
C. old mountain belts
D. platform
E. stable craton
Answer: B
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Sedimentary rocks made up of alternating thin layers of chert and iron minerals, mostly the iron
oxides hematite and magnetite; these deposits are ore minerals from which iron is extracted:a. banded iron formations (BIFs) d. evaporites b. limestones e. blue-green algae c. sand dunes
The greenhouse effect is beneficial to Earth.
Answer the following statement true (T) or false (F)
Below a temperature of 4°C (39°F), water expands as it continues to cool
Indicate whether the statement is true or false
The leading theory for the mass extinction 65 million years ago is a huge meteorite hitting the earth in the area of the Yucatan Peninsula, Mexico.
a. true b. false