Life History of a Pebble


Life History of a Pebble

A pebble may be the smoothest and most attractive rock on the seabed but it has a lifecycle just like anything else in the planet. It may not harbor all the necessities of life like other living things, but it does not always start smooth and attractive as it appears. It goes through a journey of different steps which may begin high up in the mountain, along the river bed, or sea shore cliffs. This study explores the life history of a pebble named John.

The life of John the pebble begins when forces of nature causes fragmentation and detaching from the mother rock. This may be caused by battering of the shore cliffs by natural forces of rough seas, although the sea cannot be held responsible for all the damages caused (Dobson, Sander & Woodfield, 2001). The weather is the ultimate breaker of even the hardest rocks  as forces of weather like sun, wind, rain, and others etches the rock surface. With time, the force of nature causes the hard parent rock to disintegrate giving rise to small rocks. To understand the lifecycle of John the pebble, the best beginning point is the rocks on the sea shore backed by a cliff or a rock lying high in the mountain or along the riverbed. Every day, the rock perseveres battering from the waves and they gradually undercut. A small crack on the cliff leads to a breakdown and broken rocks are left at the bottom of the cliff and John the pebble is born (BBC). The heap of broken rocks may for some time act as a barrier against the waves but they are soon turned into ammunition by the sea to attack the parent rock as they swim with the tides. They help the waves to increase their force and quicken the pace of erosion. Not all pebbles original from the sea cliff. Others originate from high in the mountain or low lands where a river starts or passes through respectively. However, the same process of weathering and fragmentation through the action of natural forces still occurs.



Life History of a Pebble

Assignment 5: Essay

1000 words ± 10%

Please give your word count (references not included). Please write proper essays, in minimum 11point font, 1.5 spaced and in full sentences and no breaks (line spaces) between paragraphs (Word often does this now, so turn off). There should be no sub-headings. Life History of a Pebble.

Tell the story.

These essays can be image rich. But you must refer to images in the text and annotate all image.

6-8 references APA style

Choose from one of the essay topics:

1. Discuss the history of the silkworm, the mulberry tree, and silk production. You might wish to focus on one aspect, such as the tree, worm-care etc.


2. Discuss the impacts of one feral animal in Australia (cats, dogs, camels, etc) on Australian native wildlife or soils.


3. Discuss the floristic links between South Africa, Australia, and Antarctica. You might wish to focus on one genus, such as Eucalyptus, or a plant family, such as the Proteaceae, which includes the genus Banksia and Protea.


4. Discuss the main contributions to natural history of Alexander von Humboldt. You might wish to focus on his expeditions to South America, or his long-term impacts on ecology.


5. Imagine your ancestors’ possible journeys over the last 70,000 years. What landscapes might they have lived in and what plants, animals, and climates experienced?


6. Describe and discuss the use of biological substances/ biota to produce colours for textiles and paints. You might wish to focus on the historical search for colours from biota, a particular colour and how it is produced, or one region.


7. Discuss the life history of a pebble. There is some good reading on this. Tell the pebble’s story. Life History of a Pebble.


8. What are mushrooms and toadstools? Discuss their terminology, their uses in food, and their toxicity………….