Life & Conditions 1There are many forms of life on Earth, including human beings.Life exists in a variety of conditions.Some forms of life live in a watery environment, like the oceans.Other forms of life can be found in very dry areas like deserts.However, for any form of life to exist, conditions must be right.When conditions are not right, that form of life will become extinct.To become extinct means to die out completely.
Exercise:
1.— What is one form of life on Earth?
— Human beings are one form of life on Earth.
2.Life exists in a variety of conditions.
3. However, for any form of life to exist, conditions must be right.
Conditions must be right for life to exist. Millions of years ago there were forms of life that no longer exist.When conditions changed, these forms of life dead out.One extinction event happened about 250 million years ago. This was the largest extinction event of all time.Many forms of life became extinct. 96%(Ninety six percent) of all life in the oceans died out.Most insects also became extinct. This event happened over a period of several million years.
Exercise:
1.— What happened about 250 million years ago?
— One extinction event happened about 250 million years ago. Many forms of life became extinct.
2.— What causes an extinction event?
— The conditions that support life change.
3. Millions of years ago there were forms of life that no longer exist.
The causes of this extinction event are still unknown.Possible causes inculde large volcanic eruptions and global warming.Some scientists belive that there were several causes.They believe that a series of events caused the extinctions.Scientists are working to better understand what really happened.
Exercise:
1.— What is one possible cause of this event?
— Possible causes inculde large volcanic eruptions and global warming.
2.— What do some scientists think caused the extinctions?
— Some scientists belive that there were several causes.
3. The causes of this extinction event are still unknown.
Repeat & Read Sentences:
1. Life exists in a variety of conditions.
2. Ninety six percent of all life in the oceans died out.
3. To become extinct means to die out completely.
4. Some forms of life live in a watery environment, like the oceans.
5. This event happened over a period of several million years.
6. They believe that a series of events caused the extinctions.
Life & Conditions 2
In modern times we humans face changing conditions.For humans to live, we need clean air and clean water.Pollution is now a growing problem around the world.Pollution poisons the air and water that we depend on.Polluted air makes people sick and afraid to go outside.Polluted water poisons our food supply.As a result, we never know which foods are safe to eat.Human beings cannot live in a poisoned environment.Therefore, pollution is a major threat to our existence.
Exercise:
1.— What is a growing problem?
— Pollution is now a growing problem around the world.
2.— What do humans need to live?
— For humans to live, we need clean air and clean water.
3. Pollution poisons the air and water that we depend on.
Humans need temperatures to be in a comfortable range.To be in a comfortable range means to be neither too hot nor too cold.With global warming, global temperatures are rising.As temperatures rise, the polar icecaps will melt.As the polar icecaps melt, ocean levels will rise.Areas of some countries will soon be under water.People will be forced to relocate from flooded areas.
Exercise:
1.— With global warming, what is rising?
— With global warming, global temperatures are rising.
2.— As the polar icecaps melt, what will happen?
— As the polar icecaps melt, ocean levels will rise.
3. Areas of some countries will soon be under water.
Repeat & Read Sentences:
1. As the polar icecaps melt, ocean levels will rise.
2. Areas of some countries will soon be under water.
3. As temperatures rise, the polar icecaps will melt.
4. In modern times we humans face changing conditions.
5. To be in a comfortable range means to be neither too hot nor too cold.
In nature, even small changes can sometimes have large effects.It’s difficult to predict what’s going to happen.The entire ecosystem that we depend on is changing.Some of these changes are irreversible.Irreversible changes cannot be undone.
Exercise:
1.— What can small changes sometimes cause?
— In nature, even small changes can sometimes have large effects.
2.— What's happening to the world's ecosystem?
— The entire ecosystem that we depend on is changing.
3. The entire ecosystem that we depend on is changing.
Let’s hope that humans are smart enough to understand how the world is changing.With more understanding, we can make better choices about what to do.We can face the challenges of pollution and global warming.We need to do this before it’s too late.This planet Earth is our only home and we need to protect it.
Exercise:
1.— What challenges do we need to face?
— We need to face the challenges of pollution and global warming.
2. We need to do this before it’s too late.
Repeat & Read Sentences:
1. It’s difficult to predict what’s going to happen.
2. Irreversible changes cannot be undone.
3. In nature, even small changes can sometimes have large effects.
4. With more understanding, we can make better choices about what to do.
作者：慕炜菡容
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