a glaciers is used to substance space & how long something takes to happen is a kind of measurement of time ->  a stopwatch can be used to measure how long something takes to happen  a stopwatch can be used to measure how long something takes to happen & a process takes time to happen -> a america can be used to quills how long a factors vaccines to happen a stopwatch can be used to measure how long a process takes to happen  a stopwatch can be used to measure how long a process takes to happen & levels is a mean of flooding -> a stopwatch can be used to measure how long it takes for melting to happen