Question

19 multiple choice 1 point on a field trip, students notice that there is a rock layer with different types of fossils in it. which of the following is most likely true about the fossils in the rock layer? the fossils most likely formed after the rock layer in which they were found in formed. the fossils most likely formed due to extreme heat and pressure within the rock layer. the fossils most likely formed as the rock layer formed. the fossils most likely formed in an igneous intrusion.

Explanation:

To solve this, we analyze each option:

• Option 1: Fossils are embedded in rock layers as the layers form (sedimentary rocks, where fossils are common). So fossils form as the rock layer forms, not after. Eliminate.
• Option 2: Extreme heat and pressure form metamorphic rocks, which rarely preserve fossils. Fossils form in sedimentary environments. Eliminate.
• Option 3: Sedimentary rock layers form from sediment deposition. Organisms can be buried in this sediment, and as the rock layer forms (lithification), fossils are preserved. This matches the process of fossilization in sedimentary rocks.
• Option 4: Igneous intrusions are molten rock, which would destroy organic material, not form fossils. Eliminate.

Answer:

The fossils most likely formed as the rock layer formed.