from Antarctica oxygen and shows the nutrients temperature changes over the last 400,000 years The causes of climate change: – Caused by man PHYSICAL/NATURAL – Caused naturally Physical causes of climate change: OUTPUT VOLCANIC ACTIVITY: ORBITAL CHANGES: The amount of energy Violent volcanic eruptions The way the Earth moves off by the sun blast lots of ash, gas and around the sun changes. For can be measured by liquids into the atmosphere. example, the path of the observing sunspots. Volcanic ash can out the Earth’s orbit around the sun Sunspots = A dark sun causing the temperature changes from an almost that appears to drop. perfect circle to an ellipse from time to time on Sulphur dioxide can turn to (an oval) and back again over the sun. sulphuric acid after an 96,000 years. Lots of sunspots = eruption and reflect the These changes affect the lots of solar energy = radiation from the sun. amount of solar radiation the warm When there is a cooling of Earth receives. If the Earth Over the last 50 the atmosphere = a volcanic receives lots of energy then years, the amount of winter. it gets warmer. sunspots have not Orbital changes may have changed so this shows caused glacial and interglacial that solar energy cycles in the Quaternary alone can not be responsible for climate change. Human causes of climate change: What is the enhanced greenhouse effect? The atmosphere allows most of the heat from the sun wave radiation) to pass straight through to warm up the Earth’s surface. However, when the Earth gives off heat in the form of long-wave radiation, some gases, such as carbon dioxide and methane (caused by huamns) are able to absorb it. Therefore, the greenhouse effect keeps the Earth warm. Causes of the greenhouse effect:
from Antarctica shows the temperature changes over the last 400,000 years oxygen and nutrients The causes of climate change: – Caused by man PHYSICAL/NATURAL – Caused naturally Physical causes of climate change: OUTPUT The amount of energy off by the sun can be measured by observing sunspots. Sunspots = A dark that appears from time to time on the sun. Lots of sunspots = lots of solar energy = warm Over the last 50 years, the amount of sunspots have not changed so this shows that solar energy alone can not be responsible for climate change. VOLCANIC ACTIVITY: Violent volcanic eruptions blast lots of ash, gas and liquids into the atmosphere. Volcanic ash can out the sun causing the temperature to drop. Sulphur dioxide can turn to sulphuric acid after an eruption and reflect the radiation from the sun. When there is a cooling of the atmosphere = a volcanic winter. ORBITAL CHANGES: The way the Earth moves around the sun changes. For example, the path of the Earth’s orbit around the sun changes from an almost perfect circle to an ellipse (an oval) and back again over 96,000 years. These changes affect the amount of solar radiation the Earth receives. If the Earth receives lots of energy then it gets warmer. Orbital changes may have caused glacial and interglacial cycles in the Quaternary Human causes of climate change: What is the enhanced greenhouse effect? The atmosphere allows most of the heat from the sun wave radiation) to pass straight through to warm up the Earth’s surface. However, when the Earth gives off heat in the form of long-wave radiation, some gases, such as carbon dioxide and methane (caused by huamns) are able to absorb it. Therefore, the greenhouse effect keeps the Earth warm. Causes of the greenhouse effect:
AQA_GCSE_Geography_Paper_1_Revision_Guide_2018(4).docx