Abstract

Why do cliffs and overhangs drop rocks? Cliffs are formed and wear away by erosion. Water and wind blast the rock with solid particles, waves pound the cliffs, and water dissolves minerals in the rocks. As the cliffs wear away, they form overhangs that weaken, break and fall suddenly. Rocks can also fall off cliffs if water or tree roots enter cracks behind the cliff face. On 27 September 1996, people were sheltering under an overhang in a limestone cliff near Gracetown, Western Australia. The overhang and part of the cliff behind collapsed, and about 2500 tonne of rock and sand fell. Nine people were killed and three others injured. The collapse was partly attributed to the rock absorbing water and becoming heavier. Remember, it is natural for rocks to fall off cliffs!
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Downloads
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Product Type/Sub Type

nonGeographicDataset - GA Publication - Other Publication

Constraints

license
Creative Commons Attribution 3.0 Australia Licence

IP Owner

Commonwealth of Australia (Geoscience Australia)

Author(s)

Date (publication)

2010

Product Type

nonGeographicDataset

Topic Category

geoscientificInformation

Keywords

GA Publication
Other Publication
Earth Sciences

Resource Language

English

Resource Character Set

utf8

Resource Security Classification

unclassified

Lineage

Unknown

Digital Transfer Options

onLine+hardcopy

DISTRIBUTION Format

pdf

Distributor

Role
distributor
Organisation Name
Geoscience Australia
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address

Metadata File Identifier

a05f7892-edff-7506-e044-00144fdd4fa6

Metadata Standard Name

ANZLIC Metadata Profile: An Australian/New Zealand Profile of AS/NZS ISO 19115:2005, Geographic information - Metadata

Metadata Standard Version

1.1

Metadata Date Stamp

2009-09-21

METADATA SECURITY CLASSIFICATION

unclassified

Metadata Contact

Role
pointOfContact
Organisation Name
Geoscience Australia
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address
Downloads
For information on acquiring this product,
please contact the Geoscience Australia Sales Centre via:

fax:
+61 2 6249 9960; or
phone:
1800 800 173 (within Australia);
 
+61 2 6249 9966 (outside Australia).

Please note that support hours are 9 am to 5 pm weekdays