Activity 47: Spreading Plates Activity 48: Other Types of Plate Motion  Challenge:  What happens when the earth’s plates move apart over time?  What happens as the earth’s plates collide or slide past each other?  Key Vocabulary:  Divergent Boundary  Convergent Boundary  Transform Boundary See these definitions in Activity 45

1.Glue in Students Sheets 47.1 and 48.1 into your notebooks. 2.Go to the following webpage: pup_plate5.html To get to this site, you can go to my webpage and on the left tabs, choose “websites” The link is there pup_plate5.html

Procedure:  Follow the procedures provided on pages D-49 and D-52 using the webpage.  Make sure you are filling out your Student Sheets as you are working. We will go over the answers tomorrow!  When you are finished your need to complete Analysis questions:  Activity 47: #1-3 on page D-50  Activity 48: #1-3 on page D-52-53

Nothing except mantle convection NONE A single earthquake Slight spreading movement of continental lithosphere Several earthquakes along divergent boundary Slight rise of magma into center of continental lithosphere Several earthquakes Increased rise of magma into center of continental lithosphere Appearance of a valley on earth’s surface. Many earthquakes Magma rising to surface Appearance of a valley on surface Oceanic lithosphere begins to form along divergent boundary A lot of earthquakes Underwater volcanoes form along divergent boundary as magma rises 2 large volcanic islands form Oceanic lithosphere is clearly center of spreading boundary Small amount of water appears in center of valley Valley fills with water, resulting in what could either be a lake or ocean

Transform Boundary Many earthquakes along transform boundary. Continental lithosphere of 2 plates slide past each other Direction of river begins to change eventually changing its course Old course becomes abandoned river bed.

Convergent (Continent – Continent) Many earthquakes Continental plates collide, forming large mountains and a thicker continental lithosphere where the plates collide. Mantle convection continues NONE

Convergent (Oceanic – Continental) Many Earthquakes Oceanic lithosphere SUBDUCTS and melts into mantle, while oceanic lithosphere of other plate crumples Magma erupts to surface, underwater VOLCANOES and eventually VOLCANIC ISLANDS form Mantle convection continues. Entire boundary is within the ocean.

Activity 47 Analysis: 1.Water between spreading plates comes from surrounding water and rain. Water always flows to the lowest elevation 2.In this activity, it took at least one million years for a narrow valley to from and it took 5 million years to observe bigger changes, such as a wider valley and the formation of the first volcano. 3.a. In 1,000 years there will still be 7 continents because plates don’t move that far in 1,000 years. b. In 20 million years, it may be possible to see some change in the shape and possibly the number of continents at that time.

Activity 48 Analysis: 1.At convergent boundaries, geological processes vary due to the type of lithosphere involved: Continental-Continental – Pushes both plates up to make MOUNTAINS. Oceanic-Continental – SUBDUCTION occurs as more dense oceanic crust goes below continental crust. 2.A. The formation of the Himalayan Mountains is an example of a continental-continental convergent boundary B. The formation of Greenland, a volcanic island country in the northern Atlantic Ocean is an example of a Divergent Boundary

Type of plate motion Scientific term for boundary type EarthquakesVolcanoes Mountain Formation CollidingConvergentXXX SlidingTransformX SpreadingDivergentXX X (volcanic)