The graph below shows changes in the earth’s average surface temperature since 1880. the general trend that is shown on the graph is that the average surface temperature on the earth has fallen by 0.4°c since 1880. has risen by nearly 1°c since 1880. dropped a fraction of a degree in 2000. rose sharply between the years 1900 and 1920.

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Ahigh energy (high speed) particle (alpha or beta or neutron) are shot at the target;

Vander waals forces are inter molecular bonds that exist within molecules of the same substance. a water molecule is made up of oxygen and hydrogen atoms which share electrons between each other. the vander waals forces are forces that exist between multitude of different  molecules of water. dipole dipole forces is the type of vander waals force that exist in water. the oxygen atom which is more electronegative pulls the shared electron closer to itself thus generating a partial negative charge while the hydrogen acquire a partial positive charge. these two different charges causes attraction to occur in water molecules.