River, a large natural stream of water flowing in a channel to the sea, a lake, Mountains , a large natural elevation of the earth's surface rising abruptly from the surrounding level; a large steep hill., Renewable energy, energy from a source that is not depleted when used, such as wind or solar power., Creatures, an animal, as distinct from a human being., Ecosystems, a biological community of interacting organisms and their physical environment., Crops, a cultivated plant that is grown on a large scale commercially, especially a cereal, fruit, or vegetable., Desert, a waterless, desolate area of land with little or no vegetation, typically one covered with sand., Rainforest, a luxuriant, dense forest rich in biodiversity, found typically in tropical areas with consistently heavy rainfall., Biology, the study of living organisms, divided into many specialized fields that cover their morphology, physiology, anatomy, behaviour, origin, and distribution., Wheat, a cereal which is the most important kind grown in temperate countries, the grain of which is ground to make flour for bread, pasta, pastry, etc..

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