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P. 103
Unit 2 READING 1
T oday we are going to discuss the
reason why .
Throughout history, most people with
darker skin have lived in very hot
places. On the other hand, those
with lighter skin have usually lived
in the northern countries.
So, why is skin color so different?
In the human body, there is a chemical called *melanin, which is brown. It
protects the human skin by taking in harmful sunlight. People in hot areas
need a lot of melanin because the sunlight there is very strong. However,
people in the northern areas don’t need it as much because there is less
sunlight. Therefore, we can say that different skin color is a way of adjusting
to the natural environment.
* melanin: a natural substance in human skin
English Usage
• Because + subject + verb, subject + verb
- We use because when you are giving the reason for something as a
conjunction.
We were late because it rained. (NOT ... because of it rained.)
Because I met you, I am happy.
100 Chapter 5 Geography
T oday we are going to discuss the
reason why .
Throughout history, most people with
darker skin have lived in very hot
places. On the other hand, those
with lighter skin have usually lived
in the northern countries.
So, why is skin color so different?
In the human body, there is a chemical called *melanin, which is brown. It
protects the human skin by taking in harmful sunlight. People in hot areas
need a lot of melanin because the sunlight there is very strong. However,
people in the northern areas don’t need it as much because there is less
sunlight. Therefore, we can say that different skin color is a way of adjusting
to the natural environment.
* melanin: a natural substance in human skin
English Usage
• Because + subject + verb, subject + verb
- We use because when you are giving the reason for something as a
conjunction.
We were late because it rained. (NOT ... because of it rained.)
Because I met you, I am happy.
100 Chapter 5 Geography
