S3 science task card By Lucy Roberts

Step 1 - Map

Step 2 - Milestones in the Earths Evolution

Pangaea - the supercontinent
300 million years Ago

Supercontinent- for the last time, all of the Earths continents came togther, creating one giant supercontinent. It lasted until 175 million years ago, then the continents tore apart.

Representation

I think this event was important because all the animals and plants that existed were on the giant continent. When they tore apart, the plants and animals became separated, leaving them on all different continents. This is how plants and animals became native to continents.

Wegeners theroy -

Wegeners theory was about continental drift, he thought that the Earths Continents were once joined together but eventually moved. In the 1940's a new instrument enabled scientists to map the ocean floor. This instrument could have supported his theory.

Step 3 - Plate Tectonics

Subduction Zone -

Describe the geological processes that occur in a subduction zone

A tectonic plate is made up of all crust or the outer layer of the earth and a skinny upper layer of the mantle, this is then called lithosphere. When an oceanic lithosphere comes across a continental lithosphere in a subduction zone, the oceanic lithosphere always goes beneath the continental plate. One plate descends under another and converts into a thick layer of mantle, called the asthenosphere. A subduction zone can be found in the Ring Of Fire, the Pacific Ocean.

Seafloor spreading -

describe the geological processes that occur in a Seafloor spreading zone

The hot magma underneath the ground rises up and eventually erupts as lava. Once the lava has cooled down it forms a new seafloor layer. Soon after more lava erupts, pushing the seafloor away- seafloor spreading. Sometimes the oceanic crust comes up against a continent. The manoeuvring oceanic crust pushes the continent away as well- continental drift. Seafloor spreading occurs in mid ocean ridges (like an underwater mountain created by plate tectonics) and long underwater mountain ranges.

Storyboard

Reflection

What went well?

I have a good understanding of the evolution of the Earth because of the story board and I know some of the 25 turning points in the earths history. I completed the task on time.

Even better if?

I added more detail into the Wegeners theroy task and where you can find/locate subduction zones and seafloor spreading.

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