1. 8 th Grade Science Bell Work Instructions A)Get your clicker, and take out a clean sheet of paper B) Write your heading, and number from 1 to 18 -Skip a space after every THIRD (3rd) number -Write the appropriate objective in that space (see other screen) C) Put all books and notebooks away. When you finish clicking in your answers… RR eturn your clicker, place all documents on the front table Then do the following: D) Turn to pages 68 to 69 in your science textbook E) Look at the pictures on the following pages p68, p70-Fig 1, p70-Fig 2, p71-Fig 3, p72-Fig 4, p 72-Fig 5 F) Write a brief description of each picture G) Then explain why you think they included each picture in this chapter Nov 25, 2013 Press the Right Arrow Button to Advance through the Presentation!

2. SPI 0807.5.2 Adaptation SPI 0807.5.3 Variation Environments always change over time Example: Antarctica is very cold and icy today since it is at the south pole. Press the Right Arrow Button to Advance through the Presentation!  So organisms must also change in order to survive  One reason that environments change is due to the movement of tectonic plates It moved south riding on a tectonic plate. As it moved the environment became colder. Yet millions of years ago Antarctica was further north and had a warm climate. Antarctica Notice that it is moving southward As the environment became colder, the plants and animals there had to adapt or die. Notes  They change seasonally and sometimes for other reasons

3. Sun Earth SPI 0807.5.2 Adaptation SPI 0807.5.3 Variation Environments always change over time Example: In reoccurring cycles lasting thousands to millions of years, the Earth wanders either a bit further away or a bit closer to the sun as it orbits the sun.  Another reason that environments change is due to the way the Earth orbits (revolves) the sun Notes When Earth orbits closer to the sun, the entire planet is warmer. When Earth orbits farther away from the sun, the entire planet gets colder. Distance As the planet becomes hotter or colder, plants and animals must adapt or die. As the distance increases or decreases between the Earth and the Sun, Earth becomes colder or hotter.

4. SPI 0807.5.2 Adaptation SPI 0807.5.3 Variation Environments always change over time Example: Volcanic eruptions can throw tons and tons of rock dust and smoke into the atmosphere creating gigantic clouds that block sunlight making the Earth colder.  Another reason for this change is due to catastrophic events like volcanoes and/or objects striking the planet from space. Notes Example: When large asteroids strike the Earth, rock is pulverized and similar to volcanic eruptions, tons of rock dust is thrown up into the atmosphere. These dust clouds block sunlight causing our planet to become colder

5. Notes SPI 0807.5.2 Adaptation SPI 0807.5.3 Variation Environments always change over time  So organisms, both plants and animals, must also change  Changing is called adapting (also called adaptation)  If an organism can not adapt to environmental changes they die  If too many of the organisms die, then the entire species will go extinct

6. Quick Review SPI 0807.5.2 Adaptation SPI 0807.5.3 Variation Questions  What is one reason that environments change?  What is another reason that environment change?  When environmental change occurs, what happens to the organisms that live in the environment?  What is extinction?  Is extinction rare or common?  Explain how humans are causing environmental change around the planet.