Fichas
Stable Earth
Fichas del conjunto (27)
- 1What is used to show the different types of earthquake wave?A seismograph is used to show the different types of earthquake waves.
- 2What do L waves do?L waves travel around the surface very slowly.
- 3What are P waves?P waves are longitudinal pressure waves.
- 4State two features of P waves.- P waves travel through the Earth at between 5km/s and 8km/s.
- P waves can pass through solids and liquids. - 5What are S waves?S waves are transverse waves.
- 6State two features of S waves.- S waves can travel through the Earth at between 3km/s and 5.5km/s.
- S waves can only pass through solids. - 7What happens to P waves as they travel through the Earth?P waves travel through the Earth:
- They are refracted by the core. - 8What means that scientists can work out the size of the Earth's core?The paths taken by P waves mean that scientists can work out the size of the Earth's core.
- 9Which type of wave are not detected on the opposite side of Earth to an earthquake?S waves are not detected on the opposite side of Earth to an earthquake.
- 10Why are S waves not detected on the opposite side of Earth to an earthquake?S waves are not detected on the opposite side of Earth to an earthquake because they will not travel through liquid.
- 11What does this tell scientists?This tells scientists that the Earth's core is liquid.
- 12What is a tan caused by?A tan is caused by the action of ultraviolet light on the skin.
- 13What is the name of the pigment produced by cells in the skin that produces a tan?Cells in the skin produce melanin, a pigment that produce a tan.
- 14Why do people with darker skin not tan as easily?People with darker skin do not tan as easily because ultraviolet radiation is filtered out.
- 15What can be used to reduce the risks of staying out in the Sun?Use a sunscreen with a high SPF to reduce risks.
- 16Write the word equation for maximum length of time to spend in the sun.maximum length of time to spend in the Sun =
published normal burn time x SPF - 17Fill the gaps: People are becoming more ..... of the dangers of ......... to ultraviolet radiation, including the use of ... beds.People are becoming more aware of the dangers of exposure to ultraviolet radiation, including the use of sun beds.
- 18What did scientists not believe at first?At first scientists did not believe there was a thinning of the ozone layer.
- 19Why did they think this?They thought their instruments were faulty.
- 20Who confirmed the results and increased confidence in the findings?Other scientists confirmed the results and increased confidence in the findings.
- 21Where is the ozone found?Ozone is found in the stratosphere.
- 22What does the ozone help to do?Ozone helps to filter out ultraviolet radiation.
- 23Which type of gases destroy the ozone and reduce the thickness of the ozone?CFC gases from aerosols and fridges destroy the ozone and reduce the thickness of the ozone layer.
- 24What does this do?This increases the potential danger to humans.
- 25Why is the ozone layer at its thinnest above the South Pole?The ozone layer is at its thinnest above the South Pole because ozone depleting chemicals work best in cold conditions.
- 26What do scientists use to monitor the thickness of the ozone layer?Scientists use satellites to monitor the thickness of the ozone layer.
- 27True or False? There is international agreement to reduce CFC emissions.True.
There is international agreement to reduce CFC emissions.
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- GCSE Science Year 10 Fichas sobre Stable Earth, creado por annjb2898 el 18/05/2014.
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- annjb2898
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