The statement that they are characterized by rapids and waterfalls is incorrect about floodplains.
Explanation:
All other points mentioned holds for flood plains:
Most of the floodplains are low lying areas
They are generally, the land areas which are adjacent to streams and rivers
They are subjected to repeated influx or flooding.
They can be simply characterized by a relatively smooth land area on whose boundary lies water stream or river which overflows or results in flooding at the time when water is high.
They collect ice cores in many locations around Earth to study regional climate variability and compare and differentiate that variability from global climate signals. The samples they collect from the ice, called ice cores, hold a record of what our planet was like hundreds of thousands of years ago.
