The movement of water from ocean through the atmosphere and back

Water cycle

Explanation:

The water from the ocean and sea evaporates into the atmosphere and goes into the sky to form clouds.

This turns the liquid water into water vapor in the atmosphere. Plants, too, help water get into the atmosphere through a process called transpiration! After absorbing water from the ground, plants “sweat” water vapor through their leaves to stay cool. Water can also get into the atmosphere from snow and ice.

Independent variable: materials.

Dependent variable: how secure the latches are.

Explanation:

IV is something this is changed (materials in this case such as clay and wood).

DV is something which is measured (the security of the latch).

Hope this helps :)