The rate of plate motion was probably slowest in the Archean Eon
Indicate whether the statement is true or false
False
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When the lower string is pulled slowly in the heavy-ball-and-strings demonstration (Figure 2.7 in your textbook), tension
A. is about the same in both strings. B. in the top string is due to your pull plus the weight of the ball. C. in the bottom string is zero. D. none of the above
Estimate the amount of electrical energy consumed during a year for a case when a garage door is lifted four times each day. Assume the garage door opener has a 1?2-hp rated motor and it takes 14 s to lift the garage door.
What will be an ideal response?
In the United States, about 4.7% of our land is set aside as protected wilderness. The vast majority of that land is in Alaska, which accounts for ____________of the total
a. 80% b. 75% c. 50% d. 45% e. Actually of the protected wilderness land in the U.S. is in Alaska
True or False: The Mohs hardness scale is a relative scale and not an absolute scale
Indicate whether this statement is true or false.