Last updated on June 28th, 2023 at 11:56 pm
Manure and Fertilizers
Why can you use chalk to write on the blackboard but not granite?
Black boards are made of slate stone that is black or dark gray in color. Chalk is softer than slate, so it can be used for writing, while granite is harder than slate, so it can cut or scratch the board.
Why are most kitchen counters made of granite?
Granite is most often used for kitchen countertops because: – It is heat resistant. It’s also unlikely to scratch.
Soil appears to be firm when we walk on it. How do you think animals like earthworms breathe inside the soil?
Earthworms breathe through their skin rather than having lungs, so their skin must stay moist to allow oxygen to enter their bloodstream.
How is soil formed?
Soil is formed by the breaking up of rocks.
What is the composition of soil?
Soil is made up of small and big stones, sand, clay, and humus.
What is soil profile?
Soil is made up of many layers, the sequence of layers of soil is called the soil profile.
Topsoil- topmost layer of soil, dark in color and contains humus.
Subsoil – below the topsoil, a light-colored layer, contains broken pieces of rocks.
Bedrock – the bottom layer of soil, made of big pieces of rocks.
Write the importance of soil.
Soil is very important for the growth of plants, plants absorb water and minerals from the soil.
Some small animals like earthworms, rabbits, and ants live in the soil.
Clay is used to making bricks; sand is mixed with cement to make buildings.
Define Gravel.
Gravel has very large grains which do not hold any water between them. They hold a lot of air.
What is soil made of?
Soil is made up of tiny pieces of rock, organic matter, water, and air.
What are the different types of soil?
There are three main types of soil: clay, sand, and loam. Clay soil is sticky and holds a lot of water. Sand soil is loose and does not hold much water. Loam soil is a mixture of clay and sand and is the most fertile type of soil.
What are the benefits of soil?
Soil provides plants with the water and nutrients they need to grow. It also helps to filter water and prevent erosion.
How can we protect soil?
We can protect soil by reducing erosion, minimizing the use of pesticides and herbicides, and planting cover crops.