All our evidence for changes in the Earth comes from looking at rocks. Folds and fossils in sedimentary rocks, radioactive dating and the weathering of ancient craters show that the oldest rocks are about 4000 million years old. That means the Earth must be at least as old as this.
The only thing that we have been able to observe directly is the Earth’s crust, which is the very thin outer rocky layer.
Evidence from earthquakes shows that the Earth has a very dense core surrounded by a solid mantle.
The Earth is almost a sphere. These are its main layers, starting with the outermost:
- the crust, which is relatively thin and rocky
- the mantle, which has the properties of a solid, but can flow very slowly
- the outer core, which is made from liquid nickel and iron
- the inner core, which is made from solid nickel and iron
This page has been adapted from www.bbc.co.uk/schools/gcsebitesize/science
The Earth's structure. Matching game
Multiple choice game
The continental Drift
Earth's relief, good images
IES LA MADRAZA WEBSITE
Let's have a look at these interesting videos.
Birth of an Atoll
physical geography activities. ESL
Ocean floor vocabularyContinentl shelf: plataforma continental
Continental slope: talud continental
Abyssal Plain: llanura oceánica
Mid-Ocean Ridges: Dorsal oceánica
Ocean trenches: Fosa Oceánica
Have a look at this image and try to fill de gaps.
Have a look at this webpage. Pay attention to slides 1,3, 4 and 6.
Now have a look to this interesting video about Pangea.
EARTHQUAKES and VOLCANOES
WHAT IS A TSUNAMI?
Tsunami is a Japanese word meaning harbour (tsu) wave (nami).
If you want to learn more...
Have you watched this movie?
Now, try to fill the blanks.
Now, wacht this interesanting video about volcanoes!