Climate Change: Natural Causes and Human Impact Assessment

Which 2 are natural causes of climate change

• astronomical

• industry

• deforestation

• greenhouse gases

What would be the average temperature on Earth without the greenhouse effect?

• -18°C
• 15°C
• 0°C
• -5°C

Which natural astronomical cycle has the longest period?

• Obliquity cycle (41,000 years)
• Precession cycle (23,000 years)
• Eccentricity cycle (100,000 years)
• Solar cycle (11 years)

What percentage of the Sun's radiation is directly reflected by the upper atmosphere, clouds, and Earth's surface?

• 30%
• 50%
• 70%
• 90%

Which of the following may naturally vary, having an impact on earth's climate?

• the shape of earth's orbit of the sun

• the sun's position

• the axis upon which the earth spins

• human's use of vehicles

How does the Earth's obliquity (axial tilt) affect climate?

• Minimal inclination leads to cooler summers and more ice formation
• Minimal inclination leads to warmer summers and less ice formation
• Maximal inclination leads to cooler summers and more ice formation
• Obliquity has no effect on climate

According to the video, how long did it take for Earth to warm up 9°C after the last ice age?

• 22,000 years
• 10,000 years
• 100,000 years
• 1,000 years

How do greenhouse gases affect Earth's temperature?

• They absorb and re-emit infrared radiation back to Earth
• They block all sunlight from reaching Earth
• They only affect nighttime temperatures
• They have no effect on temperature

What form of energy does the Sun primarily send to Earth?

• Visible light
• Infrared radiation
• Ultraviolet radiation
• Radio waves

Which statement about human impact on climate change is correct?

• Humans have increased existing greenhouse gases and added new ones
• Humans have only affected carbon dioxide levels
• Human activities have no impact on greenhouse gases
• Humans have reduced all greenhouse gas levels