Which simple machine can be described as a rope that is threaded through a wheel or disk?
The correct answer is B - Pulley
A pulley is a simple machine that is used to lift loads. It consists of a wheel on which a rope is placed and the rope is pulled by the person towards himself to lift the load that is tied on the other side of the rope. There are three main types of pulleys: fixed, movable, and compound.
Answer:
Option-C
Explanation:
Desertification refers to the formation of barren land from the arid land due to many factors which could be climatic or anthropogenic. The climate factors include no rainfall, arid conditions, less water and water bodies, overgrazing by animals and many others.
As a result of these factors, the plants die or are unable to hold the soil. This leads to loosening of soil which causes soil erosion. This converts the fertile land into infertile land and the land becomes barren.
Thus, desertification is the correct answer.
<span>1.)Water depth has the greatest importance in determining the characteristics of an aquatic ecosystem.
2.)Water flows in a lake or pond but never flows in a wetland.</span>
Answer
. Populations grow when resources are abundant
Answer:
Matter never vanishes.
Matter can change from one form to another. For example, water can be boiled, which turns it into a gas. It might seem like the boiling water vanished, but it just changed into a form we cannot see, called water vapor.
Explanation: