1. Tuesday, March 8 Do Now:
Lay out your homework (or choice card) on the table. 1. Explain what technology can be used to detect a tsunami.

2. TODAYS PLAN
Explain how technology can be used to predict and prepare for natural disasters.
Define and identify the components of the spheres of Earth (atmosphere, biosphere, hydrosphere, geosphere)
TODAYS DO
We will discuss the Save Our City Homework.
We will discuss the different spheres of Earth.

3. Why do we need to know about Earth’s spheres?

4. Earth Systems Overview
The Earth is a system consisting of four major interacting components:
the atmosphere,
the biosphere,
the hydrosphere, and
the geosphere
Let’s examine each of these four spheres in detail………
Image is from the following website:

5. The Atmosphere
The Earth is surrounded by a blanket of air, which we call the atmosphere.
The atmosphere consists of four unique layers (the troposphere, the stratosphere, the mesosphere, and the thermosphere).
The atmosphere reaches over 350 miles up from the surface of the Earth.
The atmosphere is primarily composed of nitrogen (about 78%) and oxygen (about 21%). Other components exist in small quantities.
Images are from the following website:
Atmo means “vapor”, so this is the sphere of (water) vapor.

6. The Biosphere
The biosphere is the “life zone” of the Earth, and includes all living organisms (including humans), and all organic matter that has not yet decomposed.
The biosphere is structured into a hierarchy known as a food chain.
Energy and nutrients, like carbon, are transferred from one level of the food chain to the next.
Image is from the following website:
Bio means “life”, so this is the sphere of life.

7. Hydrosphere
The hydrosphere contains all the water found on our planet.
Surface Water: Includes the ocean as well as water from lakes, rivers and creeks.
Ground Water: Includes water trapped in the soil and groundwater.
Atmosphere: water vapor.
Frozen water: Includes ice caps and glaciers. Also called the cryosphere.
Only about 3% of the water on Earth is “fresh” water, and about 70% of the fresh water is frozen in the form of glacial ice. (0.9% in liquid form)
Image is from the website:
Hydro means “water”, so this is the sphere of water.

8. Geosphere
The geosphere is the solid part of the earth, from the core to the surface.
Includes volcanoes, rocks, minerals, coal, oil etc.
Mineral resources are mined from the geosphere.
Image is from the website:

9. Earth System Science
Earth System Science is the study of how the four spheres of the Earth system interact continually, each affecting the others.
Example: A scientist that studies global warming is an Earth System Scientist.
The Earth system refers to the fact that we use models to look at parts of the Earth, helping us to describe what has happened in the past, what is currently happening, and what might happen in the future.

10. System Interactions
Volcanoes erupt, sending ash and gases into the air and sending lava and ash down onto surrounding forests and human habitations.
Image is from the website:
Geosphere
Atmosphere
Biosphere

11. System Interactions
Hurricanes sweep across the ocean and onto the land, damaging the dwellings of people who live along the coast.
Hydrosphere
Image is from the website:
Atmosphere
Geosphere
Biosphere

12. System Interactions
Earthquakes can damage buildings which may kill people, as well as cause fires which release gases into the air. Earthquakes in the ocean may cause a tsunami which can eventually hit land and kill both animals and people.
Biosphere
Image is from the website:
Geosphere
Atmosphere
Hydrosphere

13. CFA Atmosphere, Biosphere, Hydrosphere and Geosphere
1. Name the four main earth systems.
Atmosphere, Biosphere, Hydrosphere and Geosphere
2. Which branch of science studies the interactions between these earth systems?
Earth System Science: Example is a scientist that studies global warming.
Image is from the website:
3. A forest fire would effect which earth systems?
All four: Fires (Biosphere) will destroy plant and animal life while releasing smoke and other contaminants into the atmosphere, hydrosphere and geosphere.

14. Tasks:
Complete the Earth’s sphere worksheet.