Matching Pairs Our Nation's GeographyOnline version Matching review Chapter 1 by Jeannine Gryn 1 This is the reason why people modified rivers and streams 2 The surroundings in which people, plants, and animals live 3 The kind of weather a place has over a long time 4 A group of connected mountains 5 An area of flat or rolling land covered mostly by grasses 6 This describes states next to each other 7 The number of contiguous states 8 This natural process has worn down the Appalachian Mountains 9 The gradual wearing away of the Earth's surface 10 This is the relationship between Earth and the sun that causes the seasons 11 A region that has similar landform features 12 This is how the climate of the Southwest differs from the climate of the Northeast 13 It is where a place is compared to other places 14 It is an area in which many features are similar 15 This is how people change the land to improve movement of goods and people 16 Earth's seven largest landmasses 17 This is the number of people in an area the change in the Earth's tilt toward the sun forty-eight environment water was used for drinking and generating electricity population It is hotter and drier contiguous climate landform region relative location prairie continents mountain range region erosion by digging channels erosion