Need it for a grade !

1 - wave length

2 - amplitude

3 - crest

4 - trough

explanation:

duh.

layers of the earth affect the waves and these effects are seen on instruiments such as seimometers

i had this question and the answer was 3.15 miles.

martina travels from school to her mom's office. from there, she walks to school. after school, she walks to the library and then to a friends house before finally ending back at home. find martina's total distance traveled.

a) 0 miles  

b) 0.4 miles  

c) 1 mile  

d) 3.15 miles