The elements, sun, water, and age can cause a PFD to wear out over time.
The pads or shoes wear out and need replacing.
at all times when aboard
Usage. If they are strained they grow bigger, if not used they shrink.
Overtime rocks are broken down by weathering and erosion which causes the sediments to vary in size
Excessive wear, or lack of oil. Or both. Generally lack of oil is what causes the excessive wear.
It is not safe to wear halloween makeup for a long time because most halloween makeup is thick and toxic and overtime irrates the skin.
The noun overtime is an uncountable noun. Multiples are expressed in terms of 'hours of overtime', 'more overtime', 'some overtime', etc.
weathering and plant growth growing through and eventually causing a crack in the rock
wear and tear
Wind, water, waves, ice, weathering and erosion affect the shape of land over time.
Water erosion causes geography changes. Overtime, a river can erode land and change the direction of the river altogether.