HMH Geography 3rd Grade

delta

• the area where a river flows into a sea or ocean.

• a type of landform created by volcanic activity.

• a measurement of the angle of a river's flow.

• a region characterized by high rainfall and dense forests.

geography

• the study of earth's surface and the ways people use it.

• the study of celestial bodies and their movements.

• the analysis of human behavior and social structures.

• the examination of historical events and their impacts.

estuary

• the area where salt water meets, or flows into, freshwater.

• a freshwater lake surrounded by mountains.

• a coastal region with no water flow.

• a type of wetland that is always dry.

erosion

• the process of planting trees to prevent soil loss

• the slow wearing away of something as the result of exposure to wind and water.

• the act of building structures to control water flow

• the method of using chemicals to enhance soil fertility.

physical feature

• a feature of a place's land, water, climate, or plant life.

• a type of geological formation found in mountains.

• a characteristic of human-made structures.

• a measurement of temperature and humidity in an area.

plains

• a broad area of flat land.

• a type of mountain range.

• a dense forest area.

• a large body of water.

plateau

• a landform with steep sides and a flat top.

• a low-lying area with no elevation.

• a type of mountain that is flat on top.

• a valley surrounded by hills.

natural resources

• things from nature that people can use, such as trees, water, animals, or soil.

• man-made materials used for construction and manufacturing.

• products that are processed and manufactured for consumer use.

• items that are imported from other countries for trade.

climate

• weather that a place has over a long period of time.

• the daily atmospheric conditions in a specific area.

• the average temperature of a location during a single day.

• the seasonal variations in weather patterns.

ecosystem

• an area in which plants, animals, and nonliving things exist together.

• a place where only plants grow without any animals.

• a region that is devoid of any living organisms.

• an environment that only supports human life.