Earth's History Crossword

younger rocks lie above older rocks
the study of fossils of animals and plants
a layer in the earth containing large quantities of fossilized animal remains
an educated guess of a layer or rock or fossils compared to other rock layers
the actual age of a layer of rock or fossils
lava that hardens on the surface (horizontally)
magma that cools and pushes through into bodies of rock and hardens
a break in Earth’s crust
change over time in populations of related organisms
classifying or naming of organisms
organisms within a species are similar but not identical
offspring inherit characteristics (traits) that make organism fit to survive
a characteristic (trait) that helps a plant/animal survive in its environment
a tested topic explaining lots of observations
a trait being handed down to pass down a trait
a group of organisms that share common characteristics
a change in a living thing’s DNA
structures in different species with a common ancestor
structures having similar function, but not from the same species
structures in an organism that have lost all or most of its original function due to evolution