Mangrove Coast on the Move

In the picture

1. 1Badge 1 sits on the exposed roots of a toppled mangrove at the eroded edge.
2. 2Badge 2 sits on the breaking wave that cuts into the muddy bank.
3. 3Badge 3 sits on the broad current flowing along the shore.
4. 4Badge 4 sits on young mangrove shoots on the new mudflat.

Examples

• A river bend where one bank crumbles and the other builds a sandbar.
• A beach where winter storms strip sand from one end and summer waves return it to another.

Quiz: Mangrove Coast on the Move (Age 12)

1. 1

   Why does a mangrove belt slowly shift along a coast over time?

   • Because mud is worn away on one side and new mud collects on the other side.
   • Because all the mangroves grow taller and spread their roots outward.
   • Because the coast is lifted up evenly by waves along its whole length.
2. 2

   What happens at the eroded edge of a mangrove coast?

   • Waves break down the muddy bank and can expose mangrove roots.
   • Calm water drops new mud and young shoots start to grow.
   • The current carries all the mud away from the shore at once.
3. 3

   Where do young mangrove shoots appear as the mangrove belt shifts?

   • On the new mudflat where calm water lets mud settle.
   • On the eroded bank where the waves hit hardest.
   • In deep water far from the coast, where no mud collects.

The answers, each with its explanation, are in the app. This lesson has left the free week, so its quiz is part of the subscription.