Our Earth; Home Page
Scientists use models to help explain reality.
Our models are not perfect and need constant revision. A well accepted model can be called a theory or a law. Our earth was once considered a stable solid sphere. We now have a very different model, which helps explain earthquakes, volcanoes and the movement of continents around the surface of the earth. This model can be also used to explain why we have different types of rocks and how one type of rock can morph, or change, into another type of rock.
Look at the picture of the earth taken from space.
Q1. Is Australia in day or night?
Q2. Estimate the time at about Sydney on the globe?
Q3. What continent is opposite Australia on the other side of the globe?
Q4. If Australia is on a moving tectonic plate which way are we moving?
Q5. As Australia moves what happens to the countries that we are running into?
Q1. Is Australia in day or night?
Q2. Estimate the time at about Sydney on the globe?
Q3. What continent is opposite Australia on the other side of the globe?
Q4. If Australia is on a moving tectonic plate which way are we moving?
Q5. As Australia moves what happens to the countries that we are running into?
The models below give us an overview
of the current ideas about our Earth's internal structure?
Why it this still a model and not a know fact?
(Remember how deep it is to the centre of the earth!)
An Earth model with Detail
![Picture](/uploads/2/5/2/9/2529400/4570738.jpg?544)
This model show the depth of the earth in some degree of scale. It add some new terms like asthenosphere, the layer beneath the crust. It shows the ocean and the land and some mountain development. However it does not show the movement of the tectonic plates on the surface and how volcanoes and earthquakes are associated with the plate boundaries.