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