The mass number of an element is
A) the sum of the protons and the neutrons.
B) the sum of the electrons and the protons.
C) the sum of the electrons and the neutrons.
D) the sum of the isotopes.
E) the number of protons.
A
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A rock contains 12.5% of its orignal K40 (half life = 704 million years). How old is the rock?
- About 1,400 million years old
- About 2,100 million years old
- About 2,800 million years old
- About 700 million years old
Mud cracks indicate an episode of deposition and perhaps flooding followed by drier conditions. Indicate whether the statement is true or false
A mineral has the physical property of strong luster. What can be inferred about the elemental makeup?
A) The mineral could be made up of nonmetals. B) The mineral could be made up of condensed liquids. C) The mineral could be made up of metals. D) The mineral could be made up of condensed gases.
The temperature at which magnetic minerals within a lava flow align with Earth's magnetic field is called the ________ point.
A. Curie B. Hess C. Hutton D. Einstein E. Wegener