Which natural phenomenon can trigger a landslide? intense rain or an earthquake
light breezes or a flowing stream
heavy snow or continuous sunlight
icy conditions or ground surface melting

In the united states, tornadoes generally occur because of the freezing of ocean water underwater earthquakes meeting of cool and warm air masses shifting of warm and cool ocean currents

Which of the following characteristics is fixed, or definite, for all states of matter?

In a particular chemical reaction, the energy of the reactants is 30 kj and the energy of the products is 5 kj. 
 the maximum energy of the system is 40 kj. sketch a potential energy diagram for this reaction. make sure to label the energy of the reactants, the energy of the products, the activation energy, and the enthalpy change for the reaction.