Changes

==Dunes==

==Dunes==

Dunes are formed by wind deposition and transport, then the sediments accumulate in a variety of dune forms. Dune morphology is determined by the availability of sand, wind intensity, and the variability of wind directions (Lancaster, 1999; Pye and Tsoar, 1990). Dune consists of well sorted and well rounded grains, mostly quartz rich , but also heavy minerals and rock fragments are present. Coastal dune consists of many ooids , skeletal fragments, and other carbonate grains. Eolian dune is characterized by the presence of large [[cross bedding]].

Dunes are formed by wind deposition and transport, then the sediments accumulate in a variety of dune forms. Dune morphology is determined by the availability of sand, wind intensity, and the variability of wind directions (Lancaster, 1999; Pye and Tsoar, 1990). Dune consists of well sorted and well rounded grains, mostly [[quartz]] rich , but also heavy minerals and rock fragments are present. Coastal dune consists of many ooids , skeletal fragments, and other carbonate grains. Eolian dune is characterized by the presence of large [[cross bedding]].

==Interdune==

==Interdune==

==Principal Kinds Of Deep-Sea Sediment==

==Principal Kinds Of Deep-Sea Sediment==

===Kind of deep-sea sediment : Hemipelagic Mud===

===Kind of deep-sea sediment : Hemipelagic Mud===

Hemipelagic mud deposited on very low current. It is mostly found in the basin slope in front of arc.Generally it has the color of grey to green or green to reddish brown. It has mud to shale size. Beside formed from the remains of living things, hemipelagic mud also formed of soft terrigenous quartz, fieldspar mika, mineral lempung, and vilcanin material. Hemipelagic mud can also be found in the back-arc basin, which is formed by the activities of planktonic organism.

Hemipelagic mud deposited on very low current. It is mostly found in the basin slope in front of arc.Generally it has the color of grey to green or green to reddish brown. It has mud to shale size. Beside formed from the remains of living things, hemipelagic mud also formed of soft terrigenous [[quartz]], fieldspar mika, mineral lempung, and vilcanin material. Hemipelagic mud can also be found in the back-arc basin, which is formed by the activities of planktonic organism.

===Kind of deep-sea sediment : Turbidite===

===Kind of deep-sea sediment : Turbidite===