What does the following element description actually mean?iron-57
A. iron with 57 neutrons
B. 57 iron atoms
C. iron with a mass number of 57
D. iron with an atomic number of 57
E. iron with 57 protons
Answer: C
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We can say that Earth's crust floats on the mantle because
A) the mantle is very hot and flows from internal convection. B) part of the mantle is hot enough to flow as a plastic solid. C) the continental crust floats on the oceanic crust. D) the mantle is below the crust.
In most developed countries, health care is a private service that is available to those who can afford it
Indicate whether the statement is true or false.
Looking at Figure 14.11 from your textbook, the reason that the calcite accumulation is deeper on the central part of the test line from Wyoming to Wisconsin than it is on the western part is on account of
A) grass type. B) organic matter content. C) elevation. D) rainfall.
The speed of plate motion is approximately ________.
A. 1-10 km/yr B. 1-10 m/yr C. 1-10 cm/yr