A ship designed to carry items stored in containers across the sea.

A long line of jagged rock, coral, or sand just above or below the surface of the ocean. An artificial reef is when a human-made structure creates a reef on the sea floor.

A measurement of weight that is equal to 1,000 kilograms. It would take about 12-15 regular adults to weigh as much as a tonne!

A habitat is the place or environment where a plant or animal naturally lives. A habitat provides food, water, shelter, and a place to raise young. For example a coral reef or a sandy beach.

A disaster to our natural environment caused by human activity. This is different from a natural disaster, such as a flood, earthquake, or hurricane.

A shipwreck, or paeārautanga in Māori, is a ship that has been wrecked. For example, by sinking to the bottom of the ocean, or by getting stuck on land.