D. The molecules in water are constantly moving.
They are able to do this because they move around to take whatever shape of the container.
Investigate means to search for something or look in to something
SONAR stands for "sound navigation and ranging,” and it is used to map and explore the ocean floor.
Answer:
1 km
Explanation:
= Gap between antennas = 600 m
= Frequency = 1 MHz
= Distance to receiver = 2 km
c = Speed of light = 
Wavelength is given by

Distance to be moved is given by

The distance to be moved is 1 km north.
It transforms it to mechanical