Which factors most often cause erosion deposition and weathering?

The four means of erosion are:

• Fluvial (including rivers)
• Marine
• Glacial
• Aeolian (wind)

The greatest cause of erosion is debatable, but I believe the greatest factor in erosion is the sea/ocean (Marine) as this causes vast coastal recession, and in this way there is more material eroded than by any other process, but Fluvial is also a major cause. As a result of marine action, eroded fragments do not need to travel far: they only need to fall from a cliff face onto the beach or the sea-bed to count as deposited.

The greatest cause of weathering is probably biological weathering, although this is debated. I think this is the greatest cause because there are biological life-forms all over the Earth, and many of these cause weathering. Most other weathering processes rely on extreme environments and exposition to the elements.