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Lahars move rapidly down valleys like rivers of concrete. If you are on the floor of a valley that leads from a volcano and become aware of an oncoming lahar, seek high ground. Lahar is an Indonesian term that describes a hot or cold mixture of water and rock fragments that flows down the slopes of a volcano and typically enters a river valley.
at least not one that was correct. The fastest snake, the Black Mamba, can move at about 20 MPH for short distances whereas a human can move at around 28 MPH and a bear can move at around 30 MPH.So to answer your question, no a snake can not keep up with you and neither of you could outrun a bear. Source(s):xyz_gd Â· 9 years ago.Thumbs up.t least not one that was correct. The fastest snake, the Black Mamba, can move at about 20 MPH for short distances whereas a human can move at around 28 MPH and a bear can move at around 30 MPH.