Coasts: Landforms

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Coasts: Landforms by Mind Map: Coasts: Landforms

1. Cliffs

1.1. High, steep rocks facing the coast

1.1.1. Formed when rocky coasts get repeatedly washed by the waves. This weakens the rocks to cut a notch and eroded further to form a cave. Part of the cave collapses to form a cliff

1.2. Steep Cliff

1.2.1. E.g Kalaupapa National Historical Park, Hawaii

1.3. Sloping Cliff

1.3.1. Tortugas National Park, Portugal

2. Depositional landforms

2.1. Beaches

2.1.1. Formed due to deposition of sediments along the coasts.

2.1.1.1. Sediments carried by low-energy waves and longshore current is deposited along coasts, resulting in accumulation of materials which over time forms beaches.

2.2. Spits and Tombolos

2.2.1. A spit is a long, narrow ridge of sand, with one end attached to the mainland and the other protruding into the sea.

2.2.1.1. When longshore currents reach a bay or bend, they encounter shallow and shelter water that reduces their energy, forcing the current to deposit material carried by them. Over time, these materials get deposited to form spit.

2.2.2. A tombolo is an extension of a spit joining an offshore island to the mainland.

2.2.2.1. Eg. Mont St. Michel