Key Vocabulary reduce If you reduce, you use less of something. reuse If you reuse, it means you use something again. recycle If you recycle, you make something new from something old. pollution Pollution is harmful materials in the environment. Air pollution, Water pollution, Land pollution. conserve Conserve means to use carefully and without waste. trash Trash is another word for rubbish. This is something you do not need. Garbage. Take out the trash (chore). ...

Key Vocabulary sand This is a material that come from rocks. There is a lot of sand on a beach. clay This is a sticky and soft material from the earth. topsoil This is the soil nearest the surface of the ground. Topsoil is loose and soft. humus This is a substance made from dead plants and animals. Humus is in soil. granite This is a very hard, dull (gray) colored rock. Countertop. ...

Key Vocabulary natural resource something from nature that people can use. Water, air, wood, and minirals are natural resources. mineral a substance that comes from rock and soil. Minerals are nonliving things. wood the material from trees used to make paper, furniture, etc. gold a precious, yellow mineral. Gold is used for jewelry. silver a shiny gray mineral. Silver is used for making knives and forks. Silverware. copper an orange mineral. Electricity travels through copper. ...

Key Vocabulary flood A flood happens when it rains a lot and the rivers and streams overflow. drought A long period of time when there is little or no rain. The land gets very dry. crack an opening in the ground. A crack is made when the land is dry. weathering the breakdown of rocks by the action of rain, snow, wind, etc. erosion when rocks and soil are moved by wind or water to a new place. ...

Key Vocabulary river A river is a long, moving piece of water. lake A lake is a large area of water. A lake is smaller than an ocean. fresh water mountain A mountain is the highest kind of land. A mountain is very steep. Mt. Everest plain A plain is a flat land. There are not many trees on a plain. Horizontal hill A hill is a high area of land. A hill is smaller than a mountain. gentle rolling hills ...

Key Vocabulary habitat A habitat is aplace where an animal lives. forest A forest is an area with many trees and plants. rainforest A rainforest is a forest in an area where it rains a lot. jungle. desert A desert is a plae that gets little or no rain. ocean An ocean is a very large area of salt water. Arctic The Arctic is an icy and cold place near the North Pole. ...

Key Vocabulary feather A feather is one of the many soft, thin parts that cover a bird’s body. wing A wing it the part of a bird that helps it fly. Birds have two wings. beak A hard and pointed part of a bird’s mouth. A bird uses its beak to find food in the ground. fur Fur is the soft, thick hair that grows on the body of mammals. Fur keeps an animal warm. ...

Key Vocabulary mammal A mammal is an animal with hair that gives birth to live babies. reptile A reptile is an animal that lives on land and has dry skin. it is everywhere. amphibian Any animal that can live both on land and in water is an amphibian. Amphibian have smooth, wet skin. bird A bird has feathers and two wings. Most birds can fly. insect An Insect is a small creature with three body parts and six legs. Insects have no bones. ...

Key Vocabulary sunlight The light from the sun. It helps plants to grow. air The gases that surround the earth. We cannot see air, but it is everywhere. water A liquid that is necessary for life. Water moves food to the parts of a plant. space The area available for use. If there is a space, a plant can grow big and strong. soil Soil is where plants grow. Soil is the top part of the earth. ...

Key Vocabulary life cycle A life cycle is the series of changes occuring in an animal or plant. seed A seed is the small part of a plant from which a new plant may be grown. seedling A seedling is a young plant that comes out from a seed. sprout If a plant sprout, new leaves begin to grow on it. seed coat A seed coat covers and protects a seed. ...