With distance from the spreading ridge, oceanic lithosphere becomes ________ and it ________

a. younger; subducts
b. older; subducts
c. younger; subsides
d. older; subsides


d

Environmental & Atmospheric Sciences

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Approximately what percentage of blood plasma is water?

A) 15% B) 30% C) 60% D) 90%

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High levels of ____ could indicate life on other planets

a. free nitrogen b. carbon dioxide c. free oxygen d. methane e. ozone

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Which of the following fronts do not separate tropical from polar air masses?

A) cold B) warm C) stationary D) occluded

Environmental & Atmospheric Sciences

An atom loses an electron to another atom. Is this an example of a physical or chemical change?

A) physical change involving the formation of negative ions B) chemical change involving the formation of neutral atoms C) physical change involving the formation of positive ions D) chemical change involving the formation of ions

Environmental & Atmospheric Sciences