Landslides occur in all U.S. states and territories and can be (1) ___________ by a variety of factors including earthquakes, storms, volcanic eruptions, fire and by human (2) ___________ of land. Landslides can occur quickly, often with little (3) ____________ and the best way to prepare is to (4) ____________informed about changes in and around your home that could signal that a landslide is (5) ___________ to occur. In a landslide, masses of rock, earth or debris move (6) __________ a slope. Debris and mud flows are rivers of rock, earth, and (7) __________ debris saturated with water. They develop when water rapidly accumulates in the ground, during heavy rainfall or rapid snowmelt, changing the earth (8) _____________ a flowing river of mud or “slurry”. They can flow rapidly, striking with little or no (9) _____________ at avalanche speeds. They also can travel several miles (10) __________ their source, growing in size as they pick up trees, boulders, cars and other materials. 1. A. cause B. causes C. caused D. causing 2. A. modify B. modifying C. modified D. modification 3. A. notice B. attention C. review D. observation 5. A. accordingly B. properly C. hopeful D. likely 6. A. up B. down C. into D. out of 7. A. different B. similar C. another D. other 8. A. into B. in C. to D. from 9. A. warn B. warned C. warning D. warns 10. A. from B. to C. across D. along II