Sand is porous, so air get get through it, but mud can keep air out.
mud and sand
Soil,sand,and mud
The lightest would go further so the sand then the heavier ones like mud would not go that far to the stream. I think that sand will go further than the gravel then the mud! Hope that helped! Although I'm not sure about the answer! See ya! I tried helping!
sedimentary Rock formed from a rapid, subaqueous sand or mud flow.
mud+sand=clay
An octopus can hide its body in the sand or mud.
An octopus can hide its body in the sand or mud.
An octopus can hide its body in the sand or mud.
An octopus can hide its body in the sand or mud.
An octopus can hide its body in the sand or mud.
An octopus can hide its body in the sand or mud.
An octopus can hide its body in the sand or mud.
human are made of flesh and bone not mud and sand
sand
Mud and Sand - 1922 is rated/received certificates of: Canada:G (Ontario) UK:U
An octopus can hide its body in the sand or mud.