can anyone help me fast..bcz my test is going on help me fast.....n...dont copy from google. n..no spamm ..or I will be reported ur answer's... ok..
10th icse...classs .
Answers
Explanation:
1. Water is our most precious natural resource and something that most of us take for granted. We are now increasingly becoming aware of the importance of water to our survival and its limited supply, especially in such a dry continent as Australia.
The harvesting of rainwater simply involves the collection of water from surfaces on which rain falls, and subsequently storing this water for later use. Normally water is collected from the roofs of buildings and stored in rainwater tanks. This is very common in rural Australia. Water can also be collected in dams from rain falling on the ground and producing runoff.
Either way, the water collected can be considered to be precious
2. There are two main sources of water: surface water and groundwater. Surface Water is found in lakes, rivers, and reservoirs. Groundwater lies under the surface of the land, where it travels through and fills openings in the rocks. The rocks that store and transmit groundwater are called aquifers. Groundwater must be pumped from an aquifer to the earth's surface for use.
Consumers receive their water from one of two sources: a private well, or a city water system. A household well pumps groundwater for household use. The source of a city water system may be either surface water or groundwater.
3. Irrigation comes from the Latin for "moist" or "wet," but it means the purposeful wetting of something. We wouldn’t really say that a storm provides irrigation (unless we were poetically trying to personify the storm). Irrigation systems are often complex combinations of canals, channels, and hoses. The word irrigation is also used in medicine to describe the process of washing out a wound before dressing it.
4. Minerals are solid substances found in nature. They are not alive. The atoms which make up a mineral are fitted together to form a crystal. The chemical composition that is the kinds of atoms in a given kind of crystal is the same for every crystal of that kind although impurities or matter that is not part of the crystal may be included. Gold, diamond, rock salt and the graphite used to make the “lead” in pencils are examples of minerals.
Each of these minerals is different yet many times minerals look like one another or something else. A piece of green coloured plastic may look identical to an emerald. A very clear piece of quartz may look like a rough diamond. The Mols hardness test a streak test, colour, luter, cleavage and fracture are all ways of identifying minerals.
There are Two Types of minerals:
- Metallic Minerals
- Non-metallic minerals
5. Iron ores are rocks and minerals from which metallic iron can be economically extracted. The ores are usually rich in iron oxides and vary in color from dark grey, bright yellow, or deep purple to rusty red.
Manganese is a chemical element with the symbol Mn and atomic number 25. It is not found as a free element in nature; it is often found in minerals in combination with iron. Manganese is a transition metal with a multifaceted array of industrial alloy uses, particularly in stainless steels.
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