Lesson Procedures
Teacher
1. Read brief introduction below to introduce concepts for this portion of the lesson.
2. Download lesson powerpoint below for lecture portion of class, or have students research and follow notes at their own pace.
3. After lesson, or before next depending on time, play the youtube video for review (at 3/4 speed is best)
4. Review and assess before moving on. Assessments link can be found on previous page.
Students
1. Students follow along or assist in reading introduction
2. If applicable, download lessons to notability for note taking, or take out notebooks and write down important information
3. Watch review video. Pay close attention as video is quick, and information is easy to miss. Keep in mind that these pictures are from movies and documentaries, so take visuals with scifi considerations in mind.
4. Review and assess your knowledge. Write down and questions or uncertainties and be sure to ask questions before moving on.
Teacher
1. Read brief introduction below to introduce concepts for this portion of the lesson.
2. Download lesson powerpoint below for lecture portion of class, or have students research and follow notes at their own pace.
3. After lesson, or before next depending on time, play the youtube video for review (at 3/4 speed is best)
4. Review and assess before moving on. Assessments link can be found on previous page.
Students
1. Students follow along or assist in reading introduction
2. If applicable, download lessons to notability for note taking, or take out notebooks and write down important information
3. Watch review video. Pay close attention as video is quick, and information is easy to miss. Keep in mind that these pictures are from movies and documentaries, so take visuals with scifi considerations in mind.
4. Review and assess your knowledge. Write down and questions or uncertainties and be sure to ask questions before moving on.
Introduction
Earth formed approximately 4.6 billion years ago (BYA). It began as a molten rock of intense heat, continually hit by smaller celestial objects (asteroids, meteoroids, comets). Over 500 million years (MY) gravity pulled heavier elements into Earth's core and the outer layers cooled enough to form a solid crust.
Atmosphere: Exact historical composition of Earth's early atmosphere is unknown, but analysis of modern day volcanic gasses give us a clue. Gasses include water vapor, carbon dioxide, sulfur dioxide, hydrogen sulfide, hydrogen cyanide, nitrogen, and hydrogen. Little or no free oxygen would have been present.
About 4 BYA the first oceans began forming, and about 500 million years later the first evidence of life arrived.
Earth formed approximately 4.6 billion years ago (BYA). It began as a molten rock of intense heat, continually hit by smaller celestial objects (asteroids, meteoroids, comets). Over 500 million years (MY) gravity pulled heavier elements into Earth's core and the outer layers cooled enough to form a solid crust.
Atmosphere: Exact historical composition of Earth's early atmosphere is unknown, but analysis of modern day volcanic gasses give us a clue. Gasses include water vapor, carbon dioxide, sulfur dioxide, hydrogen sulfide, hydrogen cyanide, nitrogen, and hydrogen. Little or no free oxygen would have been present.
About 4 BYA the first oceans began forming, and about 500 million years later the first evidence of life arrived.
earths_early_history.pptx | |
File Size: | 3352 kb |
File Type: | pptx |