U-shaped valleys, trough valleys or glacial troughs, are formed by the process of glaciation. They are characteristic of mountain glaciation in particular. They have a characteristic U shape in cross-section, with steep, straight sides and a flat or rounded bottom.

Vicia Americana (It is a common understory plant in many types of forest and other habitats such as chaparral and it provides forage for wild and domesticated animals. This vetch is used to reclaim burned or disturbed land, such as that which has been cleared by wildfire or altered by human activities such as mining or construction. It is drought-tolerant and thrives in both dry and moist, and sandy or coarse loamy soil habitats)

Wasteland or waste land may refer to: Desert or barren, area; an uncultivated area of land, whether wooded or not, whether common land or not.

Xerocole (is a general term referring to any animal that is adapted to live in a desert. The main challenges xerocoles must overcome are lack of water and excessive heat. To conserve water they avoid evaporation and concentrate excretions. Some are so adept at conserving water or obtaining it from food that they do not need to drink at all. To escape the desert heat, xerocoles tend to be either nocturnal or crepuscular)

Calling it a night.................................

Yarrow is cultivated as an ornamental plant by many plant nurseries, but it is so much more than just a pretty face! It is extremely versatile, able to grow in a variety of soils and conditions. It is an excellent contender for the wildlife garden as its flowers are a hub of activity in the summer.  A good bee plant, it is an important nectar source for many insects.  Yarrow has an excellent reputation and is widely employed in herbal medicine, administered both internally and externally for a wide range of ailments

Zooplankton (are organisms drifting in oceans, seas, and bodies of fresh water. The word zooplankton is derived from the Greek zoon (ζ?ον), meaning "animal", and planktos (πλαγκτ?ς), meaning "wanderer" or "drifter". Individual zooplankton are usually microscopic, but some (such as jellyfish) are larger and visible to the naked eye)

Off to work.................................

Angiosperms are vascular plants. They have stems, roots, and leaves. Unlike gymnosperms such as conifers and cycads, angiosperm's seeds are found in a flower. Angiosperm eggs are fertilized and develop into a seed in an ovary that is usually in a flower.

Biotic factors

Round 3........................

Closed Ecosystem System (are ecosystems that do not rely on matter exchange with any part outside the system. The term is most often used to describe small manmade ecosystems. Such systems are scientifically interesting and can potentially serve as a life support system during space flights, in space stations or space habitats)

Dendritic drainage systems, also known as river systems, are the patterns formed by the streams, rivers, and lakes in a particular drainage basin. They are governed by the topography of the land, whether a particular region is dominated by hard or soft rocks, and the gradient of the land. Geomorphologists and hydrologists often view streams as part of drainage basins (and sub-basins). This is the topographic region from which a stream receives runoff, throughflow, and its saturated equivalent, groundwater flow.