The idea that laws in science that "work" in our world today also "worked" in the past.
Law of superposition
Within the layers of undisturbed rock, the oldest layers are on the bottom and the youngest layers are on top.(Refers to relative not numerical dating)
Principle of horizontality
Layers of sedimentary rock are laid down horizontal and this implies that if we find a rock where the layers are not horizontal some geological event has happened since their formation.
What kind of layers form when two distinct layers of sedimentary rock meet?
Layers are conformable or an unconformity exists.
What is correlation or matching of rock layers at different points based on? (3)
Stratigraphy (order of layers), fossils in the layers, and types of rocks in the layers.
Index fossils represent?
Organisms that as a species had a relatively short existence on the geological time scale and are found in wide spread geographical places.
In Nuclear decay, the specific time that an _______ nucleus will decay is not predictable but the amount of decay in a ______ of nuclei is predictable.
Half life? Is this linear?
The amount of time that it takes for 1/2 of sample of similar radioactive isotopes to decay. No it's exponential.
What life appeared in the Precambrian period first? It developed to?
One celled organisms sin nuclei (prokaryotes)
Multi celled organisms con distinct nuclei (eukaryotes)
Paleozoic Era= Age of____ (3)
Besides animals, what else began to develop?
Invertebrates. Fishes. Amphibians.