Match the following :

1-(a): formation is iceberg: anomalous expansion of water.

Water should contract in size in changing state from liquids to the solid but anomalous expansion of water is a property of water in which water expands instead of contracting when the temperature is falling from 4^°C to 0^°C. Due to this expansion the density of water decreases which causes the iceberg to float on water.

2-(f): the rise of mercury in a thermometer: thermal expansion.

Mercury used in thermometer to measure temperature rises due to heat from the body. The rise in mercury is due to the thermal expansion phenomenon in which the molecules move faster and away from each other causing expansion of any substance on the application of heat.

3-(e): automatic electric iron: bimetal strip.

A bimetallic strip is made up of two metals which have different expansion on heating. In automatic electric iron, thermostat is used which contain bimetallic strip. The thermostat is used to maintain the temperature of the iron which contain bimetal strip. The bimetal strip is used as a cut off of power when the thermostat reaches fixed temperature.

4-(b) cracking of hot glass plate when touched by cold object: sudden contraction.

All the objects expand on heating and regain their original shape on cooling. A hot plate glass plate will expand to a point when touched by a cold object the heat will flow quickly to the cold object and due to this, there will be a sudden contraction in the plate which will cause cracking of the plate.