Answer: erosion
Erosion is the process of removal and displacement of surface soil particles by the effect of wind, water or chemical agent. The sediments due to the effect of these agents gets displaced to locations other than the one where their parent rock or soil originated. A sand dune can be defined as the accumulation of grained sized sand into the shape of ridge by the effect of wind under the influence of gravitational force exerted by the earth. Dunes are formed when the loose sand is blown by wind. Therefore, sand dune is the erosion of sand by wind. Sand dunes are formed in deserts, beaches, barren fields and semiarid regions.
Answer:
Yes.
Explanation:
All matter has mass. Air is a gas and gas is matter so air <em>does </em>have mass.
Answer:
A-
Tides are caused mainly by <u> </u> in how much the moon's gravity pulls on different parts of Earth.
The force of gravity pulls the moon and Earth toward each other.
The moon's gravity causes high tide on the side closest to the moon.
The moon's gravity pulls Earth, leaving water behind causing an additional high tide.
Low tides occur between the two high tides.
There are 2 low tides and 2 high tides a day.
B-
Their combined forces produce a tide with the greatest difference between consecutive high and low tides, called a spring tide.
Spring tides occur once a month, at new moon and at full moon.
During the moon's first-quarter and third- quarter phases, the line between the moon and the sun is at right angles to the line between Earth and the moon.
This produces a spring tide, a tide with the greatest difference between consecutive low and high These occur twice a month.
(sorry I didn't really understand the first one)
