A water hyacinth is a free-floating aquatic plant that is native to South America. It is known for its beautiful purple flowers and glossy green leaves. However, it is also considered an invasive species in many parts of the world, as it can quickly spread and cover the surface of water bodies, blocking sunlight and oxygen from reaching other aquatic plants and animals. This can lead to negative impacts on the ecosystem and water quality. **

The brownish-yellow leaves of the aquatic plants water fern and water hyacinth appear wilted and discolored. They may also have a dried, crispy texture and appear to be dying. This discoloration is often a sign of stress or nutrient deficiency in the plants, which can be detrimental to their overall health and growth. **

Sure! Here's a math problem about the exponential growth of water hyacinth: The population of water hyacinth in a lake doubles every 5 days. If there are 100 water hyacinth plants in the lake today, how many will there be in 20 days? Use the formula for exponential growth: N(t) = N0 * e^(rt), where N(t) is the population at time t, N0 is the initial population, e is the base of the natural logarithm, r is the growth rate, and t is the time. **

To calculate the volume of a rectangular container for domestic water, you would multiply the length, width, and height of the container. The formula for calculating the volume of a rectangular container is V = l x w x h, where V is the volume, l is the length, w is the width, and h is the height. Once you have these measurements, simply plug them into the formula to find the volume of the container in cubic units, such as liters or gallons. This calculation can help determine the amount of water the container can hold, which is important for domestic water usage. **

Sand does not dissolve in water because it is made up of large, insoluble particles of minerals such as quartz and feldspar. These particles are held together by strong chemical bonds that are not easily broken by water molecules. Additionally, the surface area of sand particles is relatively small compared to the volume of water, making it difficult for water molecules to surround and break apart the sand particles. As a result, sand remains as solid particles in water rather than dissolving into it. **

When sand is added to hot water, it can cause the water to become cloudy and gritty. The sand particles can also settle at the bottom of the container, making it difficult to pour the water without getting sand in it. Additionally, if the sand is not clean, it can introduce impurities into the water, making it unsuitable for drinking or cooking. Therefore, it is important to avoid adding sand to hot water unless it has been properly cleaned and filtered. **

To find the depth of the swimming pool, we can use the formula: Volume = length x width x depth. Given that the pool holds 84m of water, and the length and width are 12m and 5m respectively, we can rearrange the formula to solve for the depth. So, 84m = 12m x 5m x depth. Solving for the depth, we get depth = 84m / (12m x 5m) = 1.4m. Therefore, the rectangular swimming pool is 1.4m deep. **

To paint water with sun, you can start by using warm, vibrant colors such as yellows, oranges, and reds to represent the sunlight reflecting off the water. Create a sense of movement and depth by adding highlights and shadows to show the ripples and waves in the water. Consider using a combination of blending and layering techniques to capture the shimmering effect of sunlight dancing on the water's surface. Experiment with different brush strokes and textures to bring out the dynamic and ever-changing nature of water under sunlight. **