Answer: Rust is an example of a chemical change.
Explanation: Remember, a chemical change has to do with chemicals permanently changing something. Rust comes form metal and oxygen. When these two chemicals mix, it causes rust.
Answer: True
Explanation: Jetties are structures constructed perpendicular to shore. They form a 90 degree angle to the shore and cause sediment to accumulate on the updrift side. This is the side that provides sediments.
Jetties are made of heaps of stones or concrete deposited at coastal inlets. They change the longshore current, and due to this, create updrift beaches.
Shoreline Structures such as jetties, and seawells help protect the shoreline from erosion and lessen the effect of currents and waves on the shoreline.