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Yogita Ingle 8 years ago
Soil erosion is a process that involves the wearing away of the topsoil. The process involves the loosening of the soil particles, blowing or washing away of the soil particles, and either ends up in the valley and faraway lands or washed away to the oceans by rivers and streams. Soil erosion is a natural process which has increasingly been exacerbated by human activities such as agriculture and deforestation
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Yogita Ingle 8 years ago
Materials
- 3-4 Water Glasses
- Water
- Food coloring
- 3 or 4 fresh white carnations
- Ruler
- Sharp knife
- Cutting board
Procedure
- Fill each of the three water glasses with a half cup of water.
- Add twenty drops of food coloring.
- Stir the food coloring into the water.
- Ask a grown-up to help you cut the last centimeter off the white carnation. You should cut the stem at a 45 degree angle.
- Immediately put the flower in the food coloring.
- Do not disturb the flowers. Observe them after 2, 4, 8, 24, and 48 hours, paying special attention to the bottom of the stems.
- If desired, cut 4 or so centimeters off the stem of one of the finished flowers to observe it more closely.
Results
After just a couple hours, you might notice the food coloring in the stem. After twelve or so hours, the food coloring should tint the vessels within the flower. Your results will vary depending on the quality of your flowers and cutting. When you observe the bottom of the stem, you will probably notice the round xylem tubes are filled with food coloring.
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Yogita Ingle 8 years ago
| Pinhole Camera | Plane mirror |
| (i) In pinhole camera image is inverted . | (i)In plane mirror image is erect. |
| (ii) The image formed by the Pinhole Camera is real. | (ii) The image formed by plane mirror is virtual. |
| (iii) The image formed by the Pinhole Camera may not be equal to size of the object. | (iii) The image formed by plane mirror is always equal to size of the object. |
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Sia ? 6 years, 7 months ago
Water gets polluted when unwanted and harmful chemical substances are added to the water. Untreated sewage and garbage is added to water resources to pollute water.
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