1
Main Idea:
People move from one city or country to another,the spread of diseases may result Causes Effects
A germ is completely new to a region people who already live there have no natural protection against it
People move can spread the diseases
When they go back they may carry the diseases with them 2
Main Idea:
Changes in heating system of buildings can also lead to disease
Causes Effects
Shortage
3
Main Idea:pollution of the oceans can also results in the spread of disease.
Causes Effects
Chemicals from fertilizers and human waste pollute ocean
Pollutants increased growth of tiny plants called
Algae provide a home for cholera,a deadly algae disease
Exercise 14
1
Main Idea:pilots and flight attendants have long know that they become especially forgetful when they fly often with little rest
Causes Effects
Have long flights may may with jet lag
People with jet lag some brain cells were damaged
Have damaged brain cells their brain had become smaller
2
Main Idea:ignorance about the African continent has led to some enormous errors in mapmaking
Causes
The mapmaker draw a long line of mountains,as he called kong mountain Effects
The people seemed to be an important feature of the continental