This marine giant with seven inch teeth became extinct 2.6 million years ago at 60 feet long and 100 tons.
Undisturbed sequence of rocks deposited in layers with the youngest layer on top and the bottom layer is the oldest
These ancient fish from the Mesozoic Era has been found still alive off the coast of South Africa in 1938.
Small vertebrates that need water, or a moist environment, to survive
Had earliest forms of life such as one celled organisms, cyanobacteria, and jellyfish
Supercontinent moved apart over time
Is the “calendar” for events in Earth history
Age of a rock layer (or the fossils it contains) compared to other layers
These ancient insects that lived in the Carboniferous swamps at nine centimeters
long were two times bigger than the ones that are alive now.
Age of Reptiles
This happened about 2.6 million years ago and lasted until roughly 11,000 years ago during the Cenozoic Era.
This ancient marine animal lived on the during the Paleozoic Era near the ocean floor and is known as an index fossil.
Organism that lived for a short amount of time in a large geographic area
Age of Mammals
Verticales
A loss of about three quarters of all species in existence across the entire Earth over a “short” geological period of time
This supercontinent formed during the Paleozoic Era.
Is exact age of rocks or fossils
The chicken is the closest living relative to this carnivorous dinosaur that lived during the late Cretaceous period, 68 million years ago.
These huge animals were hunted by early humans and adapted to ice age temperatures.
Oldest known fossil to have feathers
This mummy died from an arrow to the back on a high Alpine mountain pass 5,300 years ago during the Stone Age.
Age of Fish
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It looks weird when printed.
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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.
That said, different browsers print in slightly different ways, so you could try using 'print preview' using a different browser (or try the PDF button) to see if you like how that looks better.
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