modification of landforms

• What is eustatic change?

  changes in the global ocean store
• What impacts global temperatures?

  Variations in the earths orbit around the sun (400,000 years ish)

  variations in the energy produced by the sun - solar maximum every 11 years

  changes to the composition of the earths atmosphere due to volcanic eruptions which reduce incident solar radiation

  variations in the earths tilt of the axis every 41,000 years
• What does a 1°c fall in global temperatures cause?

  2m fall in sea levels
• When was the Tyrrhenian inter-glacial period?

  130,000 years ago
• What was the global temp and sea levels like 130,000 years ago?

  3°c higher

  20m higher above todays position
• Emergent landforms

  landforms shaped by wave processes during times of high sea level are left exposed when sea levels fall

  Can be found some distance inland and some distance from the modern coastline
• Name the emergent landforms

  raised beaches

  marine terraces

  abandoned cliffs
• describe raised beaches

  areas of former shore platforms that are left at a higher level than the present sea level
• How are marine terraces different to raised beaches?

  much larger scale

  do not necessarily have cliffs above them