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The 25 biggest turning points in Earth's history

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From leaps forward in evolution to devastating asteroid impacts, these were the turning points that shaped our world.

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1. 1. Fossils

2. 2. What are Fossils?* Fossils are the remains or marks of plants and animals that lived a very long time ago. They are usually found in rock and stone.* Fossils are important because they tell us a story about things that lived on the earth before us.

3. 3. What Things Become Fossils?* Animals and plants become fossils.* So do nests, eggs, footprints and even animal droppings!

4. 4. How are Fossils Made?* Fossils are made from the hard parts of plants and animals, such as: - bark, seed cases, bones and teeth.* These parts do not easily rot away after plants and animals die.* Fossils take millions of years to form.

5. 5. Turning to Stone* For example: - A starfish dies. - The soft parts of its body rot away quickly. - The harder parts slowly get covered by mud. - After millions of years, the starfish is deep in the ground. - The mud around it is crushed by the land on top and turned to stone. - So are the remains of the starfish. - Millions of years later, the stone gets worn away and the fossil can be seen.

6. 6. How Fossils are Formed

7. 7. From the Sea * The first creatures on the earth lived in the sea. * Some sea creatures made good fossils because they had hard shells and hard bones.Trilobite Fossil Horseshoe Crab Fossil Fish Fossil

8. 8. Plants* At first, there were only Pine Cone Fossil living things in the sea.* Slowly, over millions of years, plants began to grow on the land.* Some of these plants have left fossils in the rock.

9. 9. Animals* Animal fossils are often bones that have been turned to rock. Sometimes part of the flesh is preserved, but most of the time only skeletons remain.* Because of this, it is more difficult to find fossils of invertebrates. (Invertebrates are animals that don't have bones.)* We have discovered several types of animal fossils: bones, skin, teeth, claws, eggs, nests, muscles, and organs.* We have also found lots of fossils of footprints, which tell us how much animals and dinosaurs weighed and how they might have walked.

10. 10. When Did They Live?* First Fish  570 million years ago.* First plants on land  440 million years ago.* First insects and amphibians  400 million years ago.* First reptiles  360 million years ago.* First dinosaurs  245 million years ago.* First birds  210 million years ago.

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Successfully reported this slideshow. 1. Fossils 2. What are Fossils?* Fossils are the remains or marks of plants and animals that lived a very long time ago. They are usually found in rock and stone.* Fossils are important because they tell us a story about things that lived on the earth before us.

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How Asteroids Really Killed The Dinosaurs - Part 2 | Last Day Of The Dinosaurs

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Experience the Disaster that Wiped Out Dinosaurs

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