Coral reefs are home to many species of fish and sea animals. They also protect coastlines by reducing wave impact. Why are coral reefs important? Use 2 supporting details from the text.

Wind turbines use moving air to generate electricity. This energy source does not require burning fossil fuels. Why is wind energy useful? Use 2 supporting details from the text.

The human skeleton is made of 206 bones. Bones protect organs, give the body structure, and work with muscles to allow movement. Why is the skeleton important? Use 2 supporting details from the text.

Solar panels collect energy from sunlight and convert it into electricity. Many homeowners install them to lower energy bills and reduce the use of fossil fuels. Why do people install solar panels? Use 2 supporting details from the text.

Mammals are warm-blooded animals that have hair or fur. Most mammals give birth to live young and feed them milk. What characteristics make an animal a mammal? Use 2 supporting details from the text.

The Great Wall of China was built to help defend against invasions. It also allowed soldiers to travel quickly across long distances. Why was the Great Wall important? Use 2 supporting details from the text.

The Roman Empire built roads connecting cities across large distances. These roads improved trade and helped armies travel efficiently. Why were Roman roads important? Use 2 supporting details from the text.

Volcanoes can create new land when lava cools and hardens. However, eruptions can also destroy homes and threaten communities. Why are volcanoes both helpful and dangerous? Use 2 supporting details from the text.

The water cycle includes evaporation, condensation, and precipitation. This cycle moves water through Earth’s atmosphere and surface. Why is the water cycle important? Use 2 supporting details from the text.

Exercise strengthens the heart and muscles. It can also improve mood and reduce stress levels. Why is regular exercise important? Use 2 supporting details from the text.

Hurricanes form over warm ocean water and bring strong winds and heavy rain. They can cause flooding and property damage. Why are hurricanes dangerous? Use 2 supporting details from the text.

Maps use symbols, labels, and scales to represent places. They help people locate areas and understand distances. Why are maps useful? Use 2 supporting details from the text.

Bees transfer pollen from one flower to another as they gather nectar. This process helps plants produce fruits, vegetables, and seeds. Why are bees important to plants and farmers? Use 2 supporting details from the text.