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Lame puzzle
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fossil : Traces or imprints of living things.
relative dating : Method of ordering fossils to estimate their age.
absolute dating : Method of estimating the age of fossils by measuring the ratio of stable and unstable atoms.
geologic time scale : Calendar scientists use to outline the history of life on Earth.
extinct : When an animal or plant species dies out completely.
plate tectonics : Huge pieces of the Earth's crust move around the globe.
Precambrian time : ________ began when Earth originated 4.6 billion years ago.
Paleozoic era : Era in which multicellular life began.
Mesozoic era : Era in which a burst of new reptiles evolved.
Cenozoic era : The era we currently live in.
primate : Group of mammals, including humans, that have opposable thumbs and binocular vision.
Hominid : Humans and human-like ancestors are called _________.
australopithecine : First bipedal hominid from Africa that lived about two million years ago.
Neanderthal : Group of hominids that lived in Europe and Western Asia about 230,000 years ago.
Lame puzzle
Across:8. | Humans and human-like ancestors are called _________. | 9. | Traces or imprints of living things. | 10. | Group of mammals, including humans, that have opposable thumbs and binocular vision. |
| 11. | Method of estimating the age of fossils by measuring the ratio of stable and unstable atoms. | 12. | Era in which multicellular life began. | 13. | The era we currently live in. |
| | Down:1. | Calendar scientists use to outline the history of life on Earth. | 2. | First bipedal hominid from Africa that lived about two million years ago. | 3. | Huge pieces of the Earth's crust move around the globe. | 4. | Group of hominids that lived in Europe and Western Asia about 230,000 years ago. |
| 5. | Era in which a burst of new reptiles evolved. | 6. | When an animal or plant species dies out completely. | 7. | Method of ordering fossils to estimate their age. |
| |
© 2014
PuzzleFast.com, Noncommercial Use Only
Lame puzzle
Across:8. | Humans and human-like ancestors are called _________. | 9. | Traces or imprints of living things. | 10. | Group of mammals, including humans, that have opposable thumbs and binocular vision. |
| 11. | Method of estimating the age of fossils by measuring the ratio of stable and unstable atoms. | 12. | Era in which multicellular life began. | 13. | The era we currently live in. |
| | Down:1. | Calendar scientists use to outline the history of life on Earth. | 2. | First bipedal hominid from Africa that lived about two million years ago. | 3. | Huge pieces of the Earth's crust move around the globe. | 4. | Group of hominids that lived in Europe and Western Asia about 230,000 years ago. |
| 5. | Era in which a burst of new reptiles evolved. | 6. | When an animal or plant species dies out completely. | 7. | Method of ordering fossils to estimate their age. |
| |
© 2014
PuzzleFast.com, Noncommercial Use Only