Fossils Crossword
This printable crossword puzzle on the topic of Rocks & Minerals has 14 clues. Answers range from 3 to 14 letters long. This crossword is also available to download as a Microsoft Word document or a PDF.
Description
type of minerals used to date fossils
material studied to trace changes in genes over time
the __ time scale chart divides earth's history into time periods
reptile like trait of Archaeopteryx
scientists who studies fossils to understand life in the past
some ___ evolved into amphibians
bird-like trait of Archaeopteryx
Scientist Mary Schweitar found DNA in ____ bones
Mass _____ is the result of major environmental changes on earth.
modern horse descended from ____ (the first horse)
time required for one-half of a radioactive element sample to decay
The ___ record is the history of life on earth, as found in preserved remains or organisms.
bits of rock settling in layers
the space inside a rock left when remains of organisms decay
