Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Schiehallion experiment wikipedia , lookup
Spherical Earth wikipedia , lookup
History of geomagnetism wikipedia , lookup
History of Earth wikipedia , lookup
Age of the Earth wikipedia , lookup
History of geodesy wikipedia , lookup
Large igneous province wikipedia , lookup
Plate Tectonics Plate Tectonics Icons key: For more detailed instructions, see the Getting Started presentation. Flash activity. These activities are not editable. Accompanying worksheet. 1 of 31 Printable activity. Teacher’s notes included in the Notes Page. Useful web links. © Boardworks Ltd 2005 2008 How old is the Earth? What is the Earth made from? Contents What is plate tectonics? What happens at the different types of plate boundary? Summary activities The key concepts covered are: Space and Physical and human processes. 2 of 31 © Boardworks Ltd 2008 Howold old is How isthe theEarth? Earth? By the end of this section, you will: Be able to identify important points on the Earth’s timeline. Have discovered how old the Earth is. 3 of 31 © Boardworks Ltd 2008 History of the Earth 4 of 31 © Boardworks Ltd 2008 More than ever We know more about the Earth than we ever have before. Scientific advances have significantly changed our knowledge of the structure of the Earth. We can now say: what the structure of the Earth is how the Earth has changed over time what might happen to the Earth in the future. Do we know everything about the Earth’s structure and its history? 5 of 31 © Boardworks Ltd 2008 What is the Earth made What is the Earth made from? from? By the end of this section, you will: Be able to identify what the Earth is made of. Understand how these layers fit together. Learn more details about the Earth’s structure. 6 of 31 © Boardworks Ltd 2008 Looking into the Earth 7 of 31 © Boardworks Ltd 2008 Across the Earth 8 of 31 © Boardworks Ltd 2008 Structurally sound? 9 of 31 © Boardworks Ltd 2008 What is What is plate plate tectonics? tectonics? By the end of this section, you will: Know what is meant by the term plate tectonics. Know what continental drift is and how it affects Earth. Be able to identify and name the major plates. 10 of 31 © Boardworks Ltd 2008 Continental drift 11 of 31 © Boardworks Ltd 2008 Evidence for continental drift It was not until the 1960s that the theory of continental drift became accepted by the scientific community. Some continents fit together almost perfectly, e.g. South America and Africa. Similar fossils can be found on different continents. This shows these regions were once very close or joined together. Almost identical patterns of rock layers on different continents is evidence that the rocks were once close together or joined. Why are the continents moving? 12 of 31 © Boardworks Ltd 2008 What is plate tectonics? In the 1960s geologists used surveys of the ocean floor to explain continental drift with the theory of plate tectonics. The Earth's surface is made up of a number of large plates that are in constant, slow motion. The ocean floors are continually moving, spreading from the centre and sinking at the edges. The edges of these plates – plate boundaries – are where earthquakes and volcanoes occur. Convection currents in the mantle move the plates. The plates ‘float’ on the mantle and move around the Earth’s surface. How do the plates actually move? 13 of 31 © Boardworks Ltd 2008 Why do the plates move? 14 of 31 © Boardworks Ltd 2008 Plate names 15 of 31 © Boardworks Ltd 2008 What happens atthe the different What happens at different types of of plate types plateboundary? boundary? By the end of this section, you will: Know that there are different types of plate boundary. Understand what happens at the different plate boundaries. Be able to state on what type of boundary earthquakes and volcanoes are likely to happen. 16 of 31 © Boardworks Ltd 2008 Know the boundaries The tectonic plates are moving in different directions. The movements have different effects on the landscape of the Earth. Plates that are moving in opposite directions form a constructive boundary. Plates that move towards each other form either a destructive boundary or a collision boundary. Plates sliding by each other form a conservative boundary. Can you name one example of each of the different boundary types? 17 of 31 © Boardworks Ltd 2008 Have you got the edge? 18 of 31 © Boardworks Ltd 2008 Constructive plate boundary 19 of 31 © Boardworks Ltd 2008 Constructive information 20 of 31 © Boardworks Ltd 2008 Destructive plate boundary 21 of 31 © Boardworks Ltd 2008 Destructive order 22 of 31 © Boardworks Ltd 2008 Collision plate boundary 23 of 31 © Boardworks Ltd 2008 Destructive or collision? 24 of 31 © Boardworks Ltd 2008 Conservative plate boundary 25 of 31 © Boardworks Ltd 2008 Conservative order 26 of 31 © Boardworks Ltd 2008 Plate definitions 27 of 31 © Boardworks Ltd 2008 Summary activities Summary activities By the end of this section, you will: Know the key points of plate tectonics. Understand important words and phrases relating to plate tectonics. 28 of 31 © Boardworks Ltd 2008 Summary quiz 29 of 31 © Boardworks Ltd 2008 Glossary 30 of 31 © Boardworks Ltd 2008 Anagrams 31 of 31 © Boardworks Ltd 2008