Geography Form 4(2)

An example of an area of limestone in the Caribbean is

• coastal plains, Guyana

• Cockpit Country, Jamaica

• Main Ridge, Tobago

Limestone is a

• igneous rock

• sedimentary rock

• metamorphic rock

Most of the limestone rock in the Caribbean is formed from

• in shallow, calm, warm marine waters, here organisms capable of forming calcium carbonate shells and skeletons can easily extract the needed ingredients from ocean water

• in deep, rough, warm marine waters, here organisms capable of forming calcium carbonate shells and skeletons can easily extract the needed ingredients from ocean water

• by direct precipitation of calcium carbonate from marine or fresh water

Limestone rocks are used in which of the following areas (checkbox)l

• used to neutralize acidic soil

• useful raw material in the chemical industry.

• ingredient in toothpaste.

• production of cement by heating powdered limestone with clay

Which is NOT a characteristic of limestone rock

• physically tough rock

• made of carbon dioxide

• vulnerable to carbonation

• permeable and pervious rock

The process of carbonation involves

• rainwater that has absorbed carbon from the air, becomes mildly acidic this reacts with limestone rock and causes it to dissolve

• rainwater that has absorbed carbon from the air, becomes mildly acidic this reacts with the calcium carbonate and causes it to dissolve

• rainwater that has absorbed carbon dioxide from the air, becomes mildly acidic this reacts with the calcium carbonate and causes it to dissolve

Which process is NOT a processes which occurs with limestone rock

• carbonation

• mass movement

• frost action

• pillar formation

A sink hole or swallow hole occur when

• joints or fissures in the rock are enlarged by drilling holes

• joints or fissures in the rock are enlarged by carbonation or when the roof of an underground cavern collapses

• wells in the rock are enlarged by carbonation

Tick the surface features that are formed in limestone areas

• limestone pavements

• gorges and valleys

• pillars

• swallow holes

Tick the underground features that are formed in limestone areas (checkbox)

• limestone pavements

• stalagmites

• stalactites

• caverns