Heat from the Earth's core  causes convection currents in the mantle, and these cause the  plates to move around over millions of years. This movement is  often referred to as continental drift because the relative  positions of the continents change because of it.   Earth is liquid inside.
http://www.answers.com/Q/How_does_beach_drift_occur
Home > eXtra > OneGeology Kids > Earth processes > Coasts > Longshore drift. Waves that hit the beach at an angle carry sand and gravel up the beach face at an angle. When the water washes back the sediment is carried straight back down the beach face. Individual particles are moved along the beach in a zig zag pattern. This is called longshore drift.
http://www.onegeology.org/eXtra/kids/earthProcesses/longshoreDrift.html
How does continental drift occur? The Earth's crust is fragmented into large pieces called plates,  some of which carry the continents. These plates overlie the  mantle, which is solid, but under such tremen…dous pressure that in  many ways it behaves like a liquid.
http://www.answers.com/Q/How_does_beach_drift_occur
Beach Drift and Swash. The longshore current is part of the longshore transport that moves sand and sediment down the coastline, but there is also another process that contributes to the longshore transport called beach drift, or longshore drift. Beach drift is defined as the progressive movement of sand and sediment along the beach.
http://study.com/academy/lesson/contributing-factors-of-longshore-transport-beach-drift-longshore-current.html
This creates the zigzagged pattern of beach drift, or longshore drift, which is the progressive movement of sand and sediment along the beach. Beach drift and the longshore current contribute to the longshore transport, which is the movement of sand and sediment parallel to the coastline.
http://study.com/academy/lesson/contributing-factors-of-longshore-transport-beach-drift-longshore-current.html
Coastal deposition is the laying down of material on the coast by the sea. It occurs when waves lose energy or when large inputs of sediment are made into the coastal system - perhaps due to the arrival of fluvial sediment at a river estuary. Wave refraction in bays also encourages deposition due to the dispersal of wave energy.
http://www.yourclimateyourlife.org.uk/a_coasts_dep.html
The direction of this motion is always parallel to the beach face. On Folly Beach, as well as other islands along the southeastern coast, the lonshore drift most often moves in a north to south direction. This occurs because most of the wave hit the beach at an angle. In the picture below notice how the waves are approaching the beach at an angle. The yellow line represents the angle of the approaching waves. The orange arrow shows the direction of the longshore current.
http://oceanica.cofc.edu/an%20educator%27sl%20guide%20to%20folly%20beach/guide/process2.htm
slide 2 of 6. How the Process Works Longshore drift occurs as a result of wave action. Waves approaching the shore carry lots of energy. As these waves approach the beach, the base of the wave collides with the seabed. As a result, the waves topple and break apart.
http://www.brighthub.com/environment/science-environmental/articles/122016.aspx
The part of a wave in shallow water slows down, causing the wave to bend and line up nearly parallel to the shore. Most of the year, and most of the time, the movement of sediment and water (longshore current) along the California coast is from __________. north to south. A strip of land that extends inland from the coastline as far as marine influence is evidenced in land forms.
https://www.studyblue.com/notes/note/n/chapter-10/deck/8887621
Confidence votes 26.0K. Longshore drift or laminar flow occurs along beachs where the surf comes in at a horizontal angle to the beach. If the beach runs North-South, and the waves come in from the Southwest, you're likely to experience longshore drift to the North. 16 people found this useful.
http://www.answers.com/Q/When_does_longshore_drift_occur
when does beach drift occur
Beach drift occurs when the surf comes in at a horizontal angle to the beach. The beach drift occurs when the surf comes in at a horizontal angle to the beach.