Solar System

1. the path of one object in space around another object
4. Express mail service that ran from April 1860 to October 1861
5. Fourth planet from the sun, known as the "Red Planet", has many volcanoes
7. Grierson leader of the Buffalo soldiers
9. Act of 1862 Gave any head of a household, widowed women, or any man over 21 the right to claim one 160-acre portion of land
14. railroad act In 1862 President Abraham Lincoln signed the Pacific Railway Act. Two companies began building a transcontinental (across the continent) railroad, linking East with the West.
15. Removal Act Law passed in 1830 to tive Andrew Jackson the power to move American Indians west of the Mississippi River
18. The second planet from the sun and the hottest planet in the solar system, which has gasses that cause a "greenhouse like effect"
20. planets Known as the "Gas Giants", these planets orbit the sun further away and include primarily planets with no rocky surface
21. Black Kettle Southern Cheyenne Chief who moved his tribe twice in 1861 and in 1867 in accordance with treaties. Remembered for his efforts to make peace with settlers

2. Soldiers African American soldiers who fought during the Civil War and after, keeping peace between American Indians and settlers, led by Benjamin Grierson
3. Colonel George Armstrong Custer Led the battle of Washita River, in which Chief Black Kettle was killed.
4. a large, round body that revolves around a star
6. system a star and all the planets and other bodies that revolve around it
8. A small planet closest to the sun with a dense rocky surface and no atmosphere
10. small natural objects that revolve around other objects
11. Expansion migration and settlement from the East to the West
12. free roaming animal on the plains, important to the survival of Native Americans, threatened by western settlers
13. and Clark Explorers who set out in 1804 to find a water route to the Pacific ocean. Covered 8,000 miles of land from St. Louis to the Oregon coast
16. planets Known as "Terrestrial Planets", these planets orbit closest to the sun and feature hard rocky surface
17. the star at the center of the Solar System. It is a massive, hot ball of plasma, inflated and heated by energy produced by nuclear fusion reactions at its core.
19. Third planet from the sun with the only liquid water on the surface and one moon