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13 Cards in this Set
- Front
- Back
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F O O T P R I N T S |
By Halle Cambey |
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ROCKS |
- Come from Earth's crust - Earth's crust is the thin layer of the Earth - About 30km thick on lan and 8km thick under the sea - three types of rocks: ingeous, metamophic, sedimentary |
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Sedimentary rocks |
- formed from minerals that are left behind when water evaorates - often have layers showing the deposition of sediments at different time periods. - made of lots of grains - often have fossils trapped within them |
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Metamorphic Rocks |
- formed by being squeezed an twisted together sedimentary rocks are turned into metamorphic rocks by the extreme pressure |
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Igneous Rocks |
- formed when the magma cools and solidifies - contains interlocking crystals that are held together very strongly |
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TEMPERATURE VS CRYSTAL SIZE |
- crystal growth depends on lots of different variables - temperature has a direct impact on the size and the speed which crystals grow - the warmer/ higher the temerature, the more rapid te growth of the crystal but the smaller it would be. - the lower the temperature, the larger the crystal will grow. |
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WEATHERING |
-Physical Weathering: is when rocks break down of rock by water and temperature
- Chemical Weathering: break down of rocks caused by chemicals and the water in the air. |
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EROSION |
- the movement of soil and weathered rocks from one place to another through means such as water, wind, humans, ice. etc
- DEPOSITION: is the layering down of eroded material in a different place. |
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MODELS IN SCIENCE |
- models hel us to visualise and understan the princils of science and scientific theories |
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THE ROCK CYCLE |
1. Igneous rocks 2. Weathering, erosion and deposition 3. heat and pressure 4. sedimentary rocks 5. heat and pressure 6. metamorphic rocks 7. heating 8. magma 9. cooling |
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FOSSILS |
- preserved remains or traces from pervious life - to produce fossils, the living organism bust be buried - formed by small fragments are transported to the sea, they sink and form a sediment - small animals become trapped within the sediment - over millions of years, the pressure of layers above, cement the sediment together |
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GEOLOGICAL TIMESCALE |
- universe began 13.7 million years ago - solar system took shape 4.57 billion years ago - Earth formed 4.54 billion years ago -moon formed 4.5 billion years ago - first cells came 3.8 billion years ago - cambrian explosion 542 million years ago - evolution of humans 200,000 years ago |
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GRAHS, TIMELINES AND DICHOTOMOUS KEYS |
- information used to classify organisms - a graphical representation of a period of time, on which important events are marked. |
