Answer:
(a)-Rills, and arroyos or gullies develop mainly during prolonged droughts.
Explanation:
Soil erosion is the process of erosion, transport and sedimentation of soil, subsoils and rocks as an effect of the action of erosive agents such as water, winds and living things. The process of disintegration of rock particles (called sediments) is caused by the action of weathering (a set of chemical, physical and biological processes that cause soil and rock wear).
About soil erosion, we can confirm that the following information is true:
- Grasses and other vegetation, windbreaks, and contour cropping will help reduce soil loss from cultivated lands.
- Soils form naturally by weathering; if protected from erosion, sound management can maintain or enhance their nutrient levels and textural characteristics.
Answer:
The result of loss of topsoil are loss in fertility of soil, loss of water, crop production and hardened soil surface. Therefore, the correct answer to the above question is option A, B, C and D.
Explanation:
When there is a loss of top layer of soil from the earth by any means, natural or artificial, it is known as soil erosion. The soil from one place gets detached and is transported to another area. Planting more and more trees is the one of the way to stop soil erosion as the roots of the plants hold the soil.
When the soil from area is removed there is a loss of production in crop due to various reasons. The most fertile part of the soil occurs in the uppermost part. Therefore, its removal has negative impact.
<u>Answer</u>:
Science is not limited to the laboratory because it has done in a laboratory to study the physical, chemical and biological aspects of the natural system. It mean that science presents everywhere and happening at all times. It also mean that anyone can become a scientist and they can conduct the experiments with the data and a hypothesis.
<u>Explanation</u>:
Science is the study of the physical, chemical, biological, and mathematical study of nature. The science is studied in laboratory conditions to validate the various reaction and principles occurring in natural systems.
In a laboratory, small system or model is made to study the particular aspect of a large system. Thereby, science in the laboratory helps to find out the science of the actual world. Various principles, machines and designs are inspired by the natural systems.
The answer is B. Think of it this way. You always give insulin with a meal cause they need to raise their blood sugar. Glucagon is given when the blood sugar is too high and needs to come down.
Difference between a plant and an animal cell:
- Plants have cell walls, animals don't
- Plants have a large central vacuole, while animals have small scattered vacuole
- Plants cells are rigid and strong, referred to as <u><em>Turgid </em></u> in science, and have a definite shape
- Animal cells dont have a definite shape
Hope this helps
