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