The matching of rock outcrops or fossils exposed in one geographic region to similar outcrops or fossils exposed in other geographic regions
Describes a fossil with soft and hard parts that have undergone very little change since the organisms death
Establishing the order of past geologic events
Tens to hundreds of millions of years in duration
Tracing horizontal sediment layers over very large distances and in all directions
Period of time it takes for a radioactive isotope to decay to one half of its original amount
Fragments, called inclusions, in a rock layer must be older than the rock layer that contains them
Bands of alternating light and dark colored sediments of sand, clay, and silt
Fossil whose soft organic material has been removed and whose hard parts have been changed by recrystallization or mineral replacement
In an undisturbed rock sequence, the oldest rocks are at the bottom, and each consecutive layer is younger than the layer beneath it
Enables scientists to determine the numerical age of rocks and other objects
The science of using tree rings to determine absolute age
Verticales
Sediments that make up sedimentary rocks are deposited in horizontal or nearly horizontal layers
Forms when sediments cover the original hard part of an organism, such as a shell
A record of Earth's history from its origin to the present
Fossil formed when an earlier fossil of a plant or animal leaves a cavity that becomes filled with minerals or sediment
Largest unit on the time scale
Hundreds of thousands to millions of years in duration
The first 90% of the geologic time frame
Tens of millions of years in duration
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When you hit the 'Arrange' button, our algorithm will try to arrange all your words on the grid, and will move words around to try to fit the most words.
This will get all the words on the grid about 90% of the time, depending on the word list. For the other 10%, you will get an alert explaining that the words that did not fit were added to the scratchpad.
It prints on two pages.
Big puzzles won’t always print on one page — the clues and grid are the smallest we could make them while keeping them readable for everyone.
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