15. How are elements usually found?

As individual atoms in gas clouds.

In their pure state by themselves.

In mixtures with other elements.

In compounds with other elements.

Which of the following types of rock would most likely contain a fossil? slate granite lava rock limestone

Which of the following statements is most likely correct about a rock belonging to the jurassic age and a rock belonging to the cambrian age? options: 1) they have identical fossils of organisms that have evolved over time. 2) both have animal fossils preserved in them due to weathering and erosion. 3) they contain different fossils because life on earth has changed through time. 4) the fossils in them were formed on the surface of earth due to exposure to sunlight.

Which two criteria must be met before scientist can use radiocarbon dating? explain your answer