The fact that no oceanic crust older than 180 million years (Jurassic) has been found indicates what?
a. The break-up of Pangaea must have occurred before the Jurassic Period.
b. The ocean basins must be older than Jurassic age.
c. The movement of continents must have begun no earlier than the Jurassic Period.
d. The break-up of Pangaea must have begun at about the same time as these oldest basalts were formed.
e. The movement of continents must have begun no earlier than the Jurassic Period AND The break-up of Pangaea must have begun at about the same time as these oldest basalts were formed.
d. The break-up of Pangaea must have begun at about the same time as these oldest basalts were formed.
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An atmospheric carbon dioxide level of 450 ppm is widely considered to be an irreversible climate change, or ____________________.
Fill in the blank(s) with the appropriate word(s).
A wagon is being pulled with a constant force while its mass increases. Acceleration of the wagon
A. remains the same. B. increases. C. decreases. D. will be zero.
Compounds known as a-hydroxycarboxylic acids are found in many cosmetics. These compounds contain both a hydroxyl group and a carboxyl group. What is the minimum number of oxygen atoms present in an a-hydroxycarboxylic acid?
A) 1 B) 2 C) 3 D) 4
Mass production includes the standardization of parts and the division of labor
Indicate whether the statement is true or false