Carbonâ€"14 is a radioactive isotope that decays exponentially at a rate of 0. 0124 percent a year. How many years will it take for carbonâ€"14 to decay to 10 percent of its original amount? The equation for exponential decay is At = A0eâ€"rt. A. 8. 06 years B. 18. 57 years C. 8,064. 52 years D. 18,569. 23 years.

What are two ways in which waves erode the land?

1. seamount a raised footwall block between normal fault creates this 2. syncline break between rocks where a hanging wall rises relative to a footwall 3. hot spring on rolling hills, this a dip between hills 4. volcanic neck created when a block with hanging walls slips down between normal faults 5. caldera underwater volcano that never reaches above sea level 6. horst natural hot water on earth's surface containing many minerals 7. graben underwater volcano whose top is eroded flat by waves 8. crater less than a mile in diameter; looks like a bowl at the top of a volcano 9. guyot magma that filled the central vent that remains after the volcano has eroded 10. reverse fault over 1 mile in diameter; looks like a bowl over a volcano

Match the reproductive structures based on their function and the system to which they belong. egg ovary sperm vas deferens vagina fallopian tube testis urethra