Assuming this is the unit 8 waves project, it's a longitudinal wave, because the energy is going left to right.
This is a physical change because there isn’t a change in composition of the substance, sand. It is only changing the shape, not having a chemical reaction of any sort.
I hope this helps!
C.) A girl hangs by both hands, motionless, from a trapeze.
Answer:
1 : 2 cm/km or 
One cm represents 2 km.
Explanation:
If 3 cm represents 6 km on the earth, the ratio to consider is: 3 : 6 cm/km which is the same as:
1 : 2 cm/km or
One cm represents 2 km.
Glad you are coming back tomorrow I am so happy to be with you guys I will
