2.1 - North Antrim Coast

Question 1

What lithology factors influence coastal recession?

Answer 1

• Age of the rock - ancient limestones compressed and compacted over millions of year are more resistant
• Permeability - GW flow can weaken rocks by exploiting joints
• Unconsolidated material
• If there are any minerals in the rock (e.g. calcite) - can form solution

Question 2

Explain the lithology of the N Antrim Coast

Answer 2

• History of volcanism - slow cooling molten basalt erupted 56-62M years ago - now covers most of the N Antrim Coast
• Has preserved softer sedimentary rock underneath - due to warm shallow oceans
• Subsequently covered by ice sheets during Quaternary

Question 3

What type of coastline is the N Antrim Coast?

Answer 3

• Discordant

Question 4

How do igneous rocks form and what igneous rocks are in NI?

Answer 4

• Form as molten rock cools and solidifies
• Basalt

Question 5

How does sedimentary rock form and what sedimentary rocks are in NI?

Answer 5

• Composed of particles/pieces of other rocks laid down in layers over time
• Sandstone, chalk

Question 6

How do metamorphic rocks form and what is a metamorphic rock in NI?

Answer 6

• Have been subject to intense heat and/or pressure
• Schist