Lesson 2 Interactions Between Spheres (2023) PDF

INTERACTIONS BETWEEN SPHERES Lesson 2 SNC1W Ecology  Learning Goals Investigate interactions between the biosphere, hydrosphere, lithosphere, and atmosphere, and explain why these interactions are important for ecosystem sustainabilit...

INTERACTIONS BETWEEN SPHERES Lesson 2 SNC1W Ecology  Learning Goals Investigate interactions between the biosphere, hydrosphere, lithosphere, and atmosphere, and explain why these interactions are important for ecosystem sustainability.  INTERCONNECTED SPHERES Together the 4 spheres make up our Earth today and changes to any part or process of a sphere will also influence what our Earth will be like in the future! Earth’s spheres are constantly interacting. For example: Birds are a part of the __________ sphere and fly through the air which is the _________ sphere. Water is in the ___________ sphere flows through the soil which is part of the _________ sphere.  EVENTS AND SPHERE INTERACTIONS An event is something that causes a change within one or more of the spheres. A change in one sphere results in changes in others. Spheres are affected by natural and human events on our planet such as: o Volcanic o Storms o Earthquakes eruptions o Human activities – o Oil spills o Pollution building a dam or shopping mall  CAUSE AND EFFECT RELATIONSHIP There is a cause-and-effect relationship between an event and a sphere. An event can cause changes and/or be the effect of changes to one or more of Earth’s spheres. The effects can be bad or good, and short or long term.  EXAMPLE: A FOREST FIRE How might a forest fire affect each of Earth’s spheres? How might the fire be affected by what is going on with the spheres? → ex. What if it’s hot and windy? → ex. What if it rains?  LET’S PRACTICE WHAT YOU HAVE LEARNED! 1. Complete the Practice questions on your handout about sphere interactions. 2. Be ready to take up your answers as a class.  PRACTICE: HOW DO THE 4 SPHERES INTERACT? For each of the following scenarios, list the sphere where matter begins in the process and where matter ends in the process. Example: Let’s do the first one together! Hydrosphere Lithosphere  PRACTICE: HOW DO THE 4 SPHERES INTERACT? Hydrosphere Atmosphere Hydrosphere Biosphere Atmosphere Biosphere Lithosphere Atmosphere Hydrosphere Lithosphere  HUMAN ACTIVITY AFFECTS THE SPHERES The graph shows the growth of the world population over the last 2000 years. → For about 1800 years, the growth rate was relatively slow. → In the late 1800’s, the population exploded. Advances in technology and medicine has increased the life expectancy of humans. HUMAN ACTIVITY AFFECTS THE SPHERES In 1850 the average life expectancy in the U.S. was 43 years. Today, it’s approximately 80 years. Notice that life expectancy varies with location.  HUMAN ACTIVITY AFFECTS THE SPHERES The current world population is an estimated 8 billion. (2023) Human civilization now has a much greater impact on the Earth’s spheres than it did 100 years ago. Humans have become a “force of nature.”--the anthropocene!  Station-Based Activity Go to each virtual “station” on the Powerpoint in the Google Classroom and complete the handout accordingly.