Unit 5 Fossils 化石

Objective

1.Describe Utah fossils and explain how they were formed.

2. Explain how fossils can be used to make inferences about past life, climate, geology, and environments.

5.1 Three types of fossils 三类化石

一、Impression Fossil 印痕化石

Trace Impression Fossil

踪迹化石

Imprint Impression Fossil

印记化石

Cast Impression Fossil

铸模化石

二、Mineral Replacement Fossil 矿物替代化石/石化化石

三、Preserved Fossil 保存化石

Preserved in amber 琥珀

Preserved in ice 冰

Preserved in tar pits 焦油

5.2 Dinosaur extinction theories 恐龙灭绝的原因

Dinosaur died out about 65 million years ago, along with more than half of all the other animal and plant species. There are three possible explanations scientists think may have caused dinosaur extinction.

1. Asteroid Impact

Some scientists think a giant asteroid hit the earth. This resulted in a change in the climate. A dusty, gaseous smoke cloud was created, causing sunlight to be blocked. This caused dark and cold periods. Without sunlight, plants could not survive. Without plants, dinosaurs could not survive.

2.Volcano Theory

Some scientists think many huge volcanoes erupted, creating a cloud of smoke, dust, and ash that blocked the sunlight causing a change in the climate. The temperature cooled and plant production dropped. Dinosaurs and may other organisms died.

3. Competition from other animals

Dinosaurs may have starved and died because other smaller mammals ate the same food as dinosaur ate.Over time there were more small mammals than dinosaurs. These small mammals also ate dinosaur eggs.

5.3 Important Utah fossils

Dinosaur fossils found in Emery and Uintah County indicate that parts of Utah were tropical and swampy.

Mammoth fossils found in Sanpete County indicate that parts of Utah were cold.

Saber-toothed cat fossils found in Summit County indicate that parts of Utah were cold.

Trilobite fossils found in Millard County indicate that parts of Utah were once the sea floor of an ancient ocean.

5.4 Fossils and sedimentary rocks

Fossils are most commonly found in sedimentary rocks. Unlike most igneous and metamorphic rocks, sedimentary rocks form at temperatures and pressure that do not destroy fossils.

Renaissance Academy

4th Grade

Immersion

Mrs. Wyatt

Miss Zhou

Unit 5 Fossils 化石

Objective

1.Describe Utah fossils and explain how they were formed.

2. Explain how fossils can be used to make inferences about past life, climate, geology, and environments.

5.1 Three types of fossils 三类化石

5.2 Dinosaur extinction theories 恐龙灭绝的原因

Dinosaur died out about 65 million years ago, along with more than half of all the other animal and plant species. There are three possible explanations scientists think may have caused dinosaur extinction.

1. Asteroid Impact

Some scientists think a giant asteroid hit the earth. This resulted in a change in the climate. A dusty, gaseous smoke cloud was created, causing sunlight to be blocked. This caused dark and cold periods. Without sunlight, plants could not survive. Without plants, dinosaurs could not survive.

2.Volcano Theory

Some scientists think many huge volcanoes erupted, creating a cloud of smoke, dust, and ash that blocked the sunlight causing a change in the climate. The temperature cooled and plant production dropped. Dinosaurs and may other organisms died.

3. Competition from other animals

Dinosaurs may have starved and died because other smaller mammals ate the same food as dinosaur ate.Over time there were more small mammals than dinosaurs. These small mammals also ate dinosaur eggs.

5.3 Important Utah fossils

Dinosaur fossils found in Emery and Uintah County indicate that parts of Utah were tropical and swampy.

Mammoth fossils found in Sanpete County indicate that parts of Utah were cold.

Saber-toothed cat fossils found in Summit County indicate that parts of Utah were cold.

Trilobite fossils found in Millard County indicate that parts of Utah were once the sea floor of an ancient ocean.

5.4 Fossils and sedimentary rocks

Fossils are most commonly found in sedimentary rocks. Unlike most igneous and metamorphic rocks, sedimentary rocks form at temperatures and pressure that do not destroy fossils.

Are you ready for the unit test?

1.what do these words mean? Fossil, paleontologist, trilobite, extinct, preserved, impression, mineral replacement, and tropical.

2.What kind of environment do dinosaurs live?

3.Why are dinosaurs extinct?

4.Why are fossils found in sedimentary rocks?

Optional vocabulary practicing

Unit 5 Fossils 化石

Objective

1.Describe Utah fossils and explain how they were formed.

2. Explain how fossils can be used to make inferences about past life, climate, geology, and environments.

5.1 Three types of fossils 三类化石

5.2 Dinosaur extinction theories 恐龙灭绝的原因

Dinosaur died out about 65 million years ago, along with more than half of all the other animal and plant species. There are three possible explanations scientists think may have caused dinosaur extinction.

1. Asteroid Impact

Some scientists think a giant asteroid hit the earth. This resulted in a change in the climate. A dusty, gaseous smoke cloud was created, causing sunlight to be blocked. This caused dark and cold periods. Without sunlight, plants could not survive. Without plants, dinosaurs could not survive.

​

2.Volcano Theory

Some scientists think many huge volcanoes erupted, creating a cloud of smoke, dust, and ash that blocked the sunlight causing a change in the climate. The temperature cooled and plant production dropped. Dinosaurs and may other organisms died.

3. Competition from other animals

Dinosaurs may have starved and died because other smaller mammals ate the same food as dinosaur ate.Over time there were more small mammals than dinosaurs. These small mammals also ate dinosaur eggs.

5.3 Important Utah fossils

Dinosaur fossils found in Emery and Uintah County indicate that parts of Utah were tropical and swampy.

Mammoth fossils found in Sanpete County indicate that parts of Utah were cold.

Saber-toothed cat fossils found in Summit County indicate that parts of Utah were cold.

Trilobite fossils found in Millard County indicate that parts of Utah were once the sea floor of an ancient ocean.

5.4 Fossils and sedimentary rocks

Fossils are most commonly found in sedimentary rocks. Unlike most igneous and metamorphic rocks, sedimentary rocks form at temperatures and pressure that do not destroy fossils.

Are you ready for the unit test?

1.what do these words mean? Fossil, paleontologist, trilobite, extinct, preserved, impression, mineral replacement, and tropical.

2.What kind of environment do dinosaurs live?

3.Why are dinosaurs extinct?

4.Why are fossils found in sedimentary rocks?

Optional vocabulary practicing