The force that moves sediment in a landslide or mudflow is

gravity

Explanation:

Weathering is a process that breaks down rocks and other materials on the earth's surface producing 'sediments'. Movement of these sediments from one place to another is called erosion. They can be transported in different ways; through water, ice, wind or by gravity. In landslides or mudflows, sediments generally move downhill and get transported naturally under the influence of the gravitational force. Hence, The force that moves sediment in a landslide or mudflow is gravity.

the ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (uvr) from the sun, protecting life on earth from its potentially harmful effects. when the sky is clear, there is an inverse relationship between stratospheric ozone and solar uvr measured at the earth's surface.