Sunspot numbers vary over a cycle roughly _______________ years long
Fill in the blank(s) with correct word
eleven, 11
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During the Silurian, the collision of Gondwana and Laurentia produced the large landmass of
Laurasia. Indicate whether the statement is true or false.
If a mineral lacks planes along which it may cleave, what will occur?
A. The mineral will fracture in an irregular pattern. B. The mineral will fracture evenly along predictable planes. C. The mineral will still cleave, but it will only occur along one plane. D. The mineral will not break.
The first letter of the two-letter code used to identify air masses on weather maps is either m or c
a. True b. False Indicate whether the statement is true or false
Nuclear energy is often called radiant energy.
Answer the following statement true (T) or false (F)