HOW ARE SAND DUNES FORMED ?
Encyclopedic entry. A dune is a mound of sand this is formed by the wind, usually along the beach or in a desert. Dunes form when wind blows sand into a sheltered area behind an obstacle.
THE WIND BLOWING ACROSS THE DESERT SAND PILES THE SAND UP IN HILLS CALLED DUNES .
WHERE THE WIND DIRECTION KEEP CHANGING THE DUNES HAVE NO PARTICULAR SHAPE .
BUT WHEN THEY BLOW MAINLY FROM ONE DIRECTION , CRESCENT SHAPED DUNES CALLED BARCHANS OFTEN FORMED BARCHENS MAY OCCUR SINGLY OR IN CLUSTERS . WHEN WIND DRIVE SAND DUNES FORWARD THEY FORM seif dunes, named after an Arabic word meaning sword . sometimes advancing dunes bury farmland. to stop their advance, people plant tree and grasses to anchor the sand
Shapes of Dunes
Dunes can be very large geographic features or just small bumps. Most sand dunes ar classified by shape. There are five major dune shapes: crescentic, linear, star, dome, and parabolic.
Crescentic dunes are shaped like crescents, or the shape of a wide letter C. The wide side of a crescentic dune is its windward side, with a small, semi-circular slipface on the other side. Crescentic dunes are the fastest-moving type of dune, and also the most common.
Dunes can be very large geographic features or just small bumps. Most sand dunes ar classified by shape. There are five major dune shapes: crescentic, linear, star, dome, and parabolic.
Crescentic dunes are shaped like crescents, or the shape of a wide letter C. The wide side of a crescentic dune is its windward side, with a small, semi-circular slipface on the other side. Crescentic dunes are the fastest-moving type of dune, and also the most common.
Linear dunes form straight or nearly straight lines. Some linear dunes are shaped like a wiggling snake, with regular curves. Linear dunes develop where wind pressures are nearly equal on both sides of a dune.
Star dunes have pointed ridges and slipfaces on at least three sides. Star dunes develop where winds come from many different directions. The sand dunes of the Sahara Desert ergs are star dune
Star dunes have pointed ridges and slipfaces on at least three sides. Star dunes develop where winds come from many different directions. The sand dunes of the Sahara Desert ergs are star dune
Dome dunes are the rarest type of dune. They are circular and do not have a slipface. The wind can blow material onto the dune from any side.
Parabolic dunes are similar to crescentic dunes. Their shapes are roughly the same, but the slipface of a parabolic dune is on its inward side. Parabolic dunes are also called blowouts, because winds blow out the center of the dune, leaving just a rim on the outside.
Parabolic dunes are similar to crescentic dunes. Their shapes are roughly the same, but the slipface of a parabolic dune is on its inward side. Parabolic dunes are also called blowouts, because winds blow out the center of the dune, leaving just a rim on the outside.
WORKOUT FOR Upper Abs Workout FOR MORE CLICK HERE
1 Dumbbell crunch
2 Tuck and crunch
3 Modified V-sit
4 Crunch
Lower Abs Workout
1 Hanging leg raise
2 Hanging knee raise twist
Obliques And Core Workout
1 Decline plank with foot touch
HABITS TO FOLLOW FOR BEST RESULT
1. Drink a lot of Water
2. TAKE PROPER DIET
For a quick way to fuel up first thing in the morning, try this recipe: Prepare a package of instant oatmeal and mix in a scoop of whey protein powder and 1/2 cup of blueberries.
3. PRACTISE COTINIOUSLY
Everyone has abs, even if people can't always see them because they're hidden under a layer of flab.
That means you don't need to do endless crunches to carve out a six-pack. Instead, you should spend most of your gym time burning off blubber.
4. SLEEP EARLY AT NIGHT
You need sleep to unveil your six-pack. That's because lack of shut-eye may disrupt the hormones that control your ability to burn fat.
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