Cause and Effect

 A. Read the following sentences. Decide if the words in bold are the cause or the effect on the line. Then, underline the "signal" word or phrase.

1. Early man used weapons because they needed to find food.
2. The glaciers began to melt therefore, the land bridge between Asia and North America became flooded.
3. Because they wanted to learn about differenct civilizations that existed, archaeologists studied artifacts.
4. Early man slowly started to grow food and as a result, their lives became easier.
5. My sister was very tired because she stayed up past midnight.

Answer:

1. Signal : because

    they needed to find food : effect 

2. Signal : therefore

    the land bridge between Asia and North America became flooded : effect

3. Signal : Because

    Because they wanted to learn about differenct civilizations that existed : cause

4. Signal : as a result

    Early man slowly started to grow food : cause

5. Signal : because

    My sister was very tired : cause

B. Read the sentences and find the cause and effect. The first one has been done for you.

1. The milk spilled all over the floor, so jane got a mop and cleaned it up.Cause: milk spilled, effect: Jane mopped.
2. Siti has planned a trip to her uncle's house because she loves her cousins.
3. The green house gases trap the heat in the air, so the Eart becomes warmer.
4. Because the Sumatran tigers were almost extinct, the indonesian government declared them as endangered species.
5. Animals are becoming extinct because humans are moving into their habitats.

Answer:

2. Cause: she loves her cousins.

    Effect: planned a trip to her uncle's house

3. Cause: The green house gases trap the heat in the air

    Effect: Eart becomes warmer.

4. Cause: the Sumatran tigers were almost extinct

    Effect:  the indonesian government declared them as endangered species.

5. Cause: humans are moving into their habitats

    Effect: Animals are becoming extinct