Answer: 8
If EF is a line perpendicular to AB, then it forms four (90 degrees) angles intersecting AB. If AB is parallel to CD, and EF also intersects CD, then it form another four (90 degrees angles again. Total 90 degrees angles formed is 8.
Answer:
False
Explanation: Fish can't swim up the stream. Pond plants & animals would start to live there instead of stream plants & animals.
Answer:
B) an earthquake
Explanation:
An earthquake is one of the most dramatic triggers of sudden mass movements.
From the choices given, an earthquake is the most correct solution.