Question

1. What is humus?


2. Define Astronaut.


3. Define pollution.



4. What is a cyclone?


5. What is a natural disaster? Give examples.​

Answer 1

Answer:

1:- Humus

In soil science, humus (derived in 1790–1800 from the Latin humus for 'earth, ground'[1]) denominates the fraction of soil organic matter that is amorphous and without the "cellular cake structure characteristic of plants, micro-organisms or animals".

2:-Astronaut

Astronaut, designation, derived from the Greek words for “star” and “sailor,” commonly applied to an individual who has flown in outer space. More specifically, “astronaut” refers to those from the United States, Canada, Europe, and Japan who travel into space.

3:- Pollution

Pollution is the introduction of contaminants into the natural environment that cause adverse change.Pollution can take the form of chemical substances or energy, such as noise, heat, or light. Pollutants, the components of pollution, can be either foreign substances/energies or naturally occurring contaminants. Pollution is often classed as point source or nonpoint source pollution.

4:- Cyclone

In meteorology, a cyclone (/ˈsaɪ.kloʊn/) is a large scale air mass that rotates around a strong center of low atmospheric pressure, counter-clockwise in the Northern Hemisphere and clockwise in the Southern Hemisphere as viewed from above (opposite to an anticyclone).

5:- Natural disaster

A natural disaster is a major adverse event resulting from natural processes of the Earth; examples include floods, hurricanes, tornadoes, volcanic eruptions, earthquakes, tsunamis, storms, and other geologic processes. A natural disaster can cause loss of life or damage property, and typically leaves some economic damage in its wake, the severity of which depends on the affected population's resilience and on the infrastructure available.

Answer 2

Explanation:

1- the dead and decaying matter of the soil which increase the Fertility of the soil is called humus.

2-the person who is trained to travel in space craft.

3- any decaying in the constituents particles of air water soil is called pollution or we can say that the Decreasement in the quality of the air, water and soil is called pollution.

4- it is a system of winds or a part of strong winds which are huge in size and have very high speed and originate from the northern Hemispherical zone.

5- the disasters on which human has no control or they happens when nature gets disturb is called nature disaster. for ex - earthquake, cyclone etc.

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