Earth History Crossword

Used to measure time and events during Earth's history
Forms when sediments bury an organism and the sediments change into rock
Forms when minerals soak into the buried remains, replacing the remains, and changing them into rock
Forms when entire organisms or parts of organisms are prevented from decaying by being trapped in rock, ice, tar, or amber
Forms when organisms or parts are pressed between layers of soft mud or clay that hardens leaving only the carbon imprint in the rock
Forms when the mud or sand hardens to stone where a footprint, trail, or burrow of and organism was left behind
The chronicle of evolution over millions of years of geologic time engraved in the order which fossils appear in rock strata
Remains of a plant or animal that lived for a short period of time and is used to determine the relative age of rock layers
Cylinders of ice that are drilled out of glaciers and polar ice sheets and are used to understand how Earth's climate has changed
The process of determining a specific age of an object
A way to estimate the order of geologic events by using rock layers, index fossils, or other methods