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