Answer:
Composition
Explanation:
Weathering can be simply defined as the break down of rocks that is caused by the agents such as wind, water and ice. One of the process that leads to the weathering of rocks is abrasion, where the rock is scrapped off due to the continuous flow of water, blowing of wind and movement of ice over the surface of the rock. Limestone is a chemical sedimentary rock that is easily disintegrated when rainfall occurs. It dissolves the materials present in the limestone rock, and is considered to be a chemical weathering process.
When this limestone rock is subjected to extensive abrasion, then only the composition of the rock remains constant, and its other properties alters.
Answer:
Earth
Explanation:
The cosmic address of the Earth would begin with the house address, the name of our planet, Earth. Next, we would put our street name, Inner Solar System. Then, we would choose our city, Solar System of the Sun. After that, we would add our state or province. This would be the equivalent of the Solar Neighborhood which consists of all stars within 15 light years of the Sun and that include mostly cool and small red dwarf stars. After that, we would be part of the Sagittarius Arm of the Milky Way and then in the Local Group of Galaxies that include the Magellanic Clouds and many more.
A. at the same time that Earth formed
Explanation:
Geologists think the earth's continents began to form about the same time the earth was formed.
Most of the rocks on the continental crust are about the oldest that been used to date the age of our planet.
- Oceanic plates are relatively very young as they are formed at spreading centers and destroyed at convergent margins.
- Continental masses have very high absolute ages.
- The oldest rock on earth such as the Kabala Gneiss have been dated to be about 3 billion years.
- Other rocks have yielded ages close to the formation of the earth.
- We can conclude that the continents began to form immediately after the earth was formed.
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Recommended rates of potash for grazed grass are 60kg/ha and 30kg/ha of K2O for soil index 0 and 1 respectively. For soils with higher soil fertility levels no potash required.
Very large quantities of potash are removed in grass silage which must be replaced to maintain soil fertility and yield potential. The following is guide to typical potash offtakes from multi-cut silage systems.Low soil magnesium levels will affect grass yield as well as mineral balance in the animal. Apply 50-100 kg/ha MgO every three to four years at Mg index 0. Yield response is less certain at index 1 but magnesium application is justified in terms of insurance for grass yield and mineral balance for the animal, to maintain a soil magnesium index of 2.
Where lime is required and Mg levels are 0 and 1, use magnesian limestone as the most cost effective magnesium source. Where pH is satisfactory, specific magnesium fertilisers (see table below) should be used for soil improvement. Use water soluble forms of magnesium where rapid plant uptake is required.
