Lesson 1 Flashcards
How much has the average temperature risen by?
It has risen by 0.8°C (from 13.9°C to 14.7°C).
When was the temperature the highest and lowest?
It was highest in 2009 and lowest in 1870.
What impact does ice sheets melting have on our planet?
Ice reflects heat, keeping the planet cool.
What do sunspots indicate?
It indicates the amount of energy released from the sun.
How do meteorites block sunlight?
Meteorite impacts throws up a cloud of ash and dust
What impact does volcanic eruption have on the temperature?
Emission block out sunlight, lowering the temperature.
How does axis wobbles affect the amount of sunlight received?
Changes in the tilt of the earth axis affects the amount of sunlight received.
How long does it take for the earths orbit to change from circular to an ellipse (oval) and back again?
It takes 100,000 years
What are orbit changes called?
Milankovitch cycles.
When the earths wobble on its axis,when does it receive the greater amount of energy from the sun?
When the earth is more upright, it receives more energy therefore increasing the temperature.
What are sunspot activity?
Explosion of intense heat on suns surface.
When did the temperature rise fast?
Between 1950 and 1980
When the volcano in the Philippines erupted in the 1991, how much did the temperature fall by?
It fell by 1.2°C.
How much do volcanoes reduce the amount of sunlight entering our planet?
It reduces it by 10%
When is the suns cycle of solar activity high and low?
It is higher every 11 years and lower every 11 years (irregular cycle).
