How is the age of Earth measured?
A. by analyzing the strength of Earth's magnetic field
B. by counting tree rings
C. by studying the ratios of radioactive materials in rocks
D. by measuring the amount of heat the planet emits into space
Answer: C
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A ________ lens is used to compensate for hyperopia
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As the air cools at night the relative humidity usually __________
Fill in the blank(s) with correct word
Kepler originally proposed that the planets were spaced apart by ____
a. five spheres b. five regular solids c. six tetrahedrons d. five epicycles e. six regular solids
A battery operating a large flashlight produces a current of 2 amperes in a light bulb that has a resistance of 4 ohms. The voltage of the battery is 2 volts
a. True b. False Indicate whether the statement is true or false