F.4B Geography Field trip

• Place: Shek O

• Date:26/4/02

• Time: 12:35 pm

Why take a field trip?

• Suggest……

What are your objectives?

• What do I want to learn?

Objectives

• Map orientation• The coastal ecosystem – inputs and outputs• Observe coastal features• Observe weathering features• Rock types• Prepare a field report• To relax and enjoy a warm and lovely afternoon

What is my expectation?

• You should take an active part to learn.

• Answer my questions on the features along the trip – at least once per student

• Write down anything you consider important

• Take photos of features and your friends of course.

Map orientation

• Orient the map using a compass.

• Identify and name the landforms in the surrounding.

Wave counts

• Study the swash and backwash.

• Count the number of breaking waves per minute.

• Determine whether the wave is constructive or destructive.

Coastal ecosystem

• The main components – the 4 spheres

• Atmosphere – sunlight, wind

• Lithosphere – coastal zone; sediment supply

• Hydrosphere – waves, erosion and deposition

• Biosphere – plants and animals along the intertidal zone

Who am I? What am I???

• Study the features from 1 – 15.

• Tell me what they are.

Erosional Coastal Features

• Cliff and wave-cut platform - a flat rocky surface stretching from the coast to a cliff behind. It is formed by wave erosion. A notch is cut on the slope bordering the coast in the beginning. The cliff is then gradually cut back by wave erosion and slumping of the upper part to form a flat rocky platform

Erosional coastal features

• Geo - it is a narrow inlet bounded by vertical cliff on both sides. Note how the faults in the rock encourage the development of geos along the coast of Ng Fan Chau.

• Reef - a rocky stretch very near sea-level. It may be exposed at low tide.

Depositional features

• Tombolo - a dumb-bell shaped feature, formed of a spit or bar connecting an island to the mainland or two islands together.

• Beach - a long narrow belt of sand, gravel or boulder deposits.

Rock type & formation – use the booklet• Granite - an intrusive rock formed in batholi

th. It is coarse-grained. There are three sets of joints. Crystals of quartz, feldspar and mica are clearly visible.

• Feldspar porphyry – feldspar phenocrysts in a dark groundmass

• Others

Weathering features

• Physical weathering• Block disintegration - the splitting of large

blocks of rock along their joint planes when alternate expansion and contraction of the rock mass are caused by a rise or fall of temperature.

Weathering Features

• Chemical weathering• Honey-comb weathering - rain-drops and

sea sprays carrying chemicals which can dissolve some minerals like feldspar in the rock. The effect is especially noticeable in coarse -grained granite which may be pitted with numerous holes.

Look at the following cases…what do you think?• I must go to the toilet, so I do so quickly.

Nobody knows!! Ha! Ha!• I see a beautiful fish swimming in water. I

want to catch it but I do want my teacher to know. So I walk into the sea quietly.

• I climb down to the wave cut platform to explore about the feature. I can learn more than my classmates

• I am late. I think my classmates and my teachers will wait for me.

• I am not interested. So I am very unhappy.

• I have questions. I am afraid to ask.

• It is very hot. I feel exhausted. I am fainting but I do not want anybody to know.

Precautions

• Do not stay away from your teacher and your group.

• Always work in groups.• No eating or drinking on the bus.• Bring a bottle of water. An umbrella if necessary• No walkman or discman• Take care of your personal belongings such as mo

bile phone

That is all!

•Watch the film on coastal landforms