1. What are strata? 2. Where are the oldest fossils based on Steno’s ideas?

3. Geologists were unable to compare rocks from one location to another. William Smith figured out how to match the ages of layers of rock by comparing within the layers.

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

The small molecule cyclic amp (camp) takes about 0.2 second to diffuse 10 μm, on average, in a cell. suppose that camp is produced near the plasma membrane on one end of the cell; how long will it take for this camp to diffuse through the cytosol and reach the opposite end of a very large cell, on average? assume that the cell is 200 μm in diameter.

The main ingredient of magma is a pahoehoe. b silca c dissolved gases d obsidian