What word refers to when forests are cut down and the area is permanently cleared for another use?

• erosion
• weathering
• deforestation
• global warming

What are the two main reasons why deforestation happens?

• timber and mining
• food production and mining
• timber and food production
• mining and urbanization (build cities)

What word refers to cutting and burning down parts of a forest to make room for crops?

• deforestation
• clear-cutting
• erosion
• slash and burn

Which of the following is an effect of deforestation?

• Soil erosion and lack of biodiversity
• Droughts and aridity
• Habitat loss and climate change.
• All of these answers are effects of deforestation.

What causes the air pollution in Mexico City?

• 3.6 million vehicles
• Poor quality fuel
• Pollution is trapped by the Sierra Madre mountains
• All of these are causes of the pollution in Mexico City

What problem do the Sierra Madre Mts. cause  Mexico City?

• trap the pollution in the city since it can't be blown away by winds
• stops the water from flowing to the oceans
• allows the air pollution to be blown away by the winds

What is pollution that comes out of cars called?

• photosynthesis
• excellerate
• emmissions

What mountain range is Mexico City located in?

• Andes Mts.
• Sierra Madre Mts. 
• Rocky Mts. 

In addition to cars, _____________ add pollutants to Mexico City's air. 

• cars
• baseball stadiums
• factories

Which of the following descriptors is  NOT one of the solution to Mexico City's pollution problems?

• ride public transportation
• educate people
• find alternative types of fuel
• make people use the cars every day