2. Rocks Any solid mass of mineral or mineral-like matter that occurs naturally as part of our planet.

3. Rocks Ayers Rock is one of Australia’s most recognizable natural icons. It is the largest monolith in the world. The world- renowned sandstone formation stands 348 meters high.

4. Igneous Rock When magma cools and hardens beneath the surface or as the result of a volcanic eruption this rock forms

5. Igneous Rock In 1906, Teddy Roosevelt named Devil’s Tower, an extinct volcano core, the United States’ first national monument.

6. Sedimentary Rocks Bits of broken rocks, minerals, or other materials are compacted and cemented to form this type of rock

7. Sedimentary Rocks The Grand Canyon is one of the most recognizable landforms on planet Earth and is made from many layers of sedimentary rocks!

8. Metamorphic Rocks Under extreme pressure and temperature conditions this type of rock may form

9. Metamorphic Rocks Diamonds formed by the same kind of heat and pressure that changes rocks into metamorphic rocks.

10. Rock Cycle Interactions among Earth’s water, air, and land can cause rocks to change from one type to another.

11. Rock Cycle As long as the Earth’s core is still warm, the rock cycle will continue and change the face of the planet!

12. Magma Melted rock in a liquid form located beneath the Earth’s crust

13. Magma The last two times the magma chamber at Yellowstone collapsed, the area where Las Vegas is was buried under volcanic ash!

14. Lava Melted rock in a liquid form located on the Earth’s surface

15. Lava Anything in the path of a lava flow will be destroyed and eventually buried by the flow. Some materials which will not fall will catch on fire due to the extremely high temperatures found in the flow.

16. Sediments Rock or minerals that have been broken down due to weathering

17. Sediments With enough time, even sand dunes can become sedimentary rock.

18. Weathering Process in which rocks are physically and chemically broken down by water, air, and living things.

19. Weathering Acid rain has caused chemical weathering to erode many features from old statues and tombstones.