Todays Objective What Features Allow Earth To Support

Today’s Objective: What Features Allow Earth To Support Life? . Do Now – Using ESRT page 1: pink notes packet page 10 even #’s Take out video permissions Homework: -Permission Slips due tomorrow -Lab 20 due Friday

**Review ** Life and the Atmosphere • The Earth’s original atmosphere was made up of gases similar to those released in volcanic eruptions – water vapor, carbon dioxide & nitrogen. • Later, primitive organisms evolved that used photosynthesis and released oxygen.

Composition of Atmosphere • Nitrogen and Oxygen gases make up 99%. Gases in the atmosphere today: Page 1 ESRT

What features allow Earth to support life? • Abundant usable water. • Suitable atmosphere. • Suitable range of temperatures. We are known as the Goldilocks planet. Not to hot ~ Not to cold.

What determines the temperature of a planet? • Distance from the sun. • Presence and composition of the atmosphere.

Brainpop - Earth

Other Parts of the Atmosphere: Water Vapor: - source of all clouds and precipitation - absorbs heat (from earth & sun) Dust Particles: - sea salt -soil - ash from volcanic eruptions - pollution

Ozone: - form of oxygen that combines three oxygen atoms into each molecule (O 3).

What do you think could happen if there was no ozone? - If ozone did not filter most UV radiation and all of the sun’s UV rays reached the surface of Earth, our planet would be uninhabitable for many living organisms.

Human Influence on the Atmosphere: - Emissions from cars and factories account for nearly half the primary pollutants by weight.

What changes can “we” make to help our atmosphere? • Use buses and trains instead of cars • Walking or cycling • Car pool • Use less electricity

Why less electricity? • • Example: LIPA Tour of an electrical power plant: https: //www. youtube. com/watch? v=0 ftl-WM 6 wms

Example of daily energy usage