Human Impact

What is the greenhouse effect?

• the burning of fossil fuels causes gases to mix with water in the atmosphere
• ground level ozone and vehicle exhaust react in the presence of sunlight
• certain gases such as carbon dioxide act like a blanket and keep the sun's energy close to earth

Which is a cause of climate change?

• melting of sea ice
• cutting down trees
• severe storms 
• changes in plant life 

What is biodiversity?

• a population of a species 
• the growth of cities
• destruction of natural habitats
• a variety of organisms 

Which is an effect of climate change?

• melting of sea ice 
• burning of fossil fuels
• cutting down trees 
• vehicle exhaust

1. Which biome has the highest biodiversity and is the most threatened?

• Temperate forests

• grasslands

• tropical rain forests

• deserts

1. Which of the following is not a renewable resource?

• coal

• wind energy

• solar energy

• water

When human-made chemicals and garbage find their way into nature and harm the air, soil, and water it is called

• pollution

• habitat destruction

• overexploitation

• climate change

Why are fossil fuels a nonrenewable resource? 

• they take millions of years to replace 
• they can be used over and over again
• they are used to heat and light homes 
• they cause air and water pollution 

Most water pollution is the result of

• human activities.
• drought.
• volcanic eruptions.
• storms.

What is the major cause for air pollution? 

• factories and cars
• cigarretes 
• deforestation
• oil spills