What causes floods?

Circle the odd ones. Give reasons for your choice: 

river       lake         pond          sea 

Circle the odd one. Give reason for your choice; 

temperature              humidity              lightning               surface area

Circle the odd one. Give reason for your choice.

ice       water       nitrogen         steam 

Circle the odd one. Give reason for your choice:

dew          fog          ice          hail

Choose the appropriate word and fill in the blank.

The water cycle helps in regulating the _____ (water/gas) level on the earth.

Fill in the blank with an appropriate word:

The lack of rain may cause _____ (drought/flood).