7 remaining American Idol contestants

1. Skylar Laine
2. Colton Dixon
3. Jessica Sanchez
4. Joshua Ledet
5. Hollie Cavanagh
6. Phillip Phillips
7. Elise Testone

7 US National Parks

1. Crater Lake National Park - Oregon
2. Gates of the Arctic National Park and Preserve - Alaska
3. Great Smoky Mountains National Park - North Carolina
4. Sequoia National Park - California
5. Zion National Park - Utah
6. Death Valley National Park - California/Nevada
7. Mammoth Cave National Park - Kentucky

7 authors that write/wrote under a pen-name

1. Richard Bachman - Stephen King
2. Lewis Carroll - Charles Dodgson
3. George Eliot - Mary Ann Evans
4. C S Forester - Cecil Smith
5. George Orwell - Eric Arthur Blair
6. James Tiptree Jr - Alice Sheldon
7. Joseph Conrad - Józef Teodor Konrad Korzeniowski

7 largest reservoirs in the world

1. Nasser, Egypt/Sudan - 5248 km²
2. Bratskoye, Russia - 5470 km²
3. Bukhtarma, Kazakhastan - 5490 km²
4. Kariba, Zimbabwe/Zambia - 5580 km²
5. Kujbyshevskoe, Russia - 6450 km²
6. Smallwood, Canada - 6527 km²
7. Volta, Ghana - 8502 km²

7 types of crane

1. Jib crane
2. Level luffing crane
3. Self-erecting crane
4. Telescopic handler crane
5. Crawler crane
6. Carry deck crane
7. Sidelift crane