# Constructive and Destructive Waves Flashcards

1️⃣ Familiarise yourself with the flashcards:

• Look through all the flashcards to see what’s on both sides.
• Make sure you understand the information on each card. If something’s unclear, click the link to the revision notes at the bottom of the page for more details.

2️⃣ Test yourself:

• Look at the question or prompt on each card and try to remember the answer before flipping it over.
• Check the answer and make a note of any cards you find challenging and need to go over more.

3️⃣ Consistently Review and Practice:

• Use spaced repetition: spend more time on the cards you struggle with and go over them more often.
• Regularly review all the flashcards to help you better understand and retain the information over time.

Note: We may include questions that have multiple correct answers. It’s useful to remember specific examples to understand these concepts better.

## What factors determine the strength of a wave?

The strength of a wave depends on its fetch (distance over water that the wind has blown), the strength of the wind, and the duration of time the wind has blown.

## What is the fetch and why is it important?

The fetch is the distance over water that the wind blows. It influences the size and energy of waves, with a longer fetch typically creating larger, more energetic waves.

## What defines a constructive wave?

Constructive waves have a long wavelength, low height, strong swash, weak backwash, and a lower frequency of 6-8 waves per minute, building up beaches by depositing material.

## What defines a destructive wave?

Destructive waves have a short wavelength, high height, weak swash, strong backwash, and a higher frequency of 10-12 waves per minute, eroding beaches by pulling material away.

## How do constructive waves affect the coastline?

Constructive waves build up beaches by carrying material up onto the beach with their strong swash and leaving it there due to their weak backwash.

## How do destructive waves affect the coastline?

Destructive waves erode beaches by pulling material away with their strong backwash and have enough energy to drag it back into the ocean.

## What is the difference in frequency between constructive and destructive waves?

Constructive waves have a lower frequency of 6-8 waves per minute, while destructive waves have a higher frequency of 10-12 waves per minute.

## What are swash and backwash?

Swash is the movement of water up the beach, and backwash is the movement of water down the beach, back towards the ocean.