Using relative dating what can geologists determine
The lowest layer of rock or of a structure would be known as the oldest.
The highest layer is then known as the newest/youngest.
other method for rocks is that they determine composition of layers.
they know how much time takes to precipitate compound that rock is made of (thats how they determined when was oxigen created on earth)…
Geologists have studied the order in which fossils appeared and disappeared through time and rocks. Fossils can help to match rocks of the same age, even when you find those rocks a long way apart.
This matching process is called correlation, which has been an important process in constructing geological timescales.
Some fossils, called index fossils, are particularly useful in correlating rocks.
For a fossil to be a good index fossil, it needs to have lived during one specific time period, be easy to identify and have been abundant and found in many places. If you find ammonites in a rock in the South Island and also in a rock in the North Island, you can say that both rocks are Mesozoic.
A half-life is half of the time it takes for a radioactive atom to decay, and it helps in determining the absolute age of a rock because if you know its half-life, you can multiply it by two to get its actual or absolute age.
Correlation with them has helped geologists date many New Zealand rocks, including those containing dinosaurs.
Bring relative dating principles to life with the activity Rock layers and relative dating.
Different isotopic elements-such as uranium, rubidium, argon, and carbon-have varying (but constant) rates of radioactive decay.
This constancy provides a "radiometric clock," allowing scientists to analyze rock samples…