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