Legumes, for example, will add nitrogen to the soil, naturally fertilizing the area. Marigolds produce chemicals that repel certain insect pests. Here is a brief list of plants along with their companion plants. In some cases plants will be listed that may have a negative impact: 1. Bush Beans -- Beets, Cabbage, Carrots, Celery, Corn, Cucumbers, Eggplant, Lettuce, Pea, Radish, Strawberry, Savory, Marigold. 2.
Sand dunes cannot be formed without sand and wind. Most sand dunes form in deserts and sandy beaches. Enormous sand dunes in the Sahara Desert are called sand seas. Understanding the types of sand dunes and their formation assists in the development of infrastructures like gas and oil fields. It also helps in controlling the movement of sand. Subsequently, the five major types of sand dunes are Star, linear, parabolic, barchan, and reversing sand dunes. The velocity, turbulence, and direction of wind determine the types of sand dunes formed. Also, the amount of sand available also influences the kind of sand dune formed. For instance, star dunes form whenever there are large amounts of sand. 5. Star
In physical geography, a dune is a hill of sand built by either wind or water flow. Dunes occur in different shapes and sizes, formed by interaction with the flow of air or water.Most kinds of dunes are longer on the windward side where the sand is pushed up the dune and have a shorter slip face in the lee of the wind. The valley or trough between dunes is called a slack.A dune field is an area covered by extensive sand dunes. crescentic dune with a star dune superimposed on its crest is the most common complex dune. Simple dunes represent a wind regime that has not changed in intensity or direction since the formation of the dune, while compound and complex dunes suggest that the intensity and direction of the wind has changed.