1. What qualifies a fossil to be used to find the absolute age of rocks?
if the plant or animal existed for a limited period of time and in a small area
if the plant or animal existed for a long period of time and in a wide area
if the plant or animal existed for a long period of time and in a small area
if the plant or animal existed for a limited period of time and in a wide area
2. Which quantity helps determine the absolute age of rocks and fossils?
the ratio of carbon-12 to carbon-14
the difference between the number of protons and neutrons in carbon-14
the ratio of protons to neutrons in carbon-14
the difference between the amounts of carbon-12 and carbon-14
3. Which quantity helps determine the absolute age of rocks and fossils?
the ratio of carbon-12 to carbon-14
the difference between the number of protons and neutrons in carbon-14
the ratio of protons to neutrons in carbon-14
the difference between the amounts of carbon-12 and carbon-14
4. The half-life of carbon-14 is 5,700 years. A certain sample of wood has 20 grams of carbon-14 when it is alive. How many grams of carbon will it have after 5,700 years?
5 grams
10 grams
2 grams
40 grams
