The dry bulb and wet bulb thermometers are used for measuring humidity in the air. The dry bulb and wet bulb thermometers are two identical thermometers fixed to a wooden frame. The bulb of the dry thermometer is kept uncovered and is exposed to the air while the bulb of the wet bulb thermometer is wrapped up with a piece of wet muslin, which is kept continuously moist by dipping a strand of it into a small vessel of distilled water. The evaporation from the wet bulb lowers its temperature.

Dry bulb readings are not affected by the amount of water vapour present in the air, but the wet bulb readings vary with it since the rate of evaporation is dependent upon the amount of water vapour present in the air. The greater the humidity in the air, the slower the rate of evaporation and hence, the difference between the readings of the dry bulb and wet bulb will be small. On the other hand, when the air is dry, the evaporation from the surface of the wet bulb is rapid, which would lower its temperature and the difference between the two readings would be larger. Hence, the difference of the readings of the dry bulb and the wet bulb thermometers determines the state of the atmosphere with regard to its humidity. The larger the difference, the more arid is the air.

The regional geography is a main branch of geography.

Its focus is on the study of connection between various natural and cultural geographic factors in a particular landscape or region.

While its counterpart is systematic geography, which includes the study of specific element of geography such as agriculture, food, lifestyle in order to know the processes which are influenced by various factors.

A biome can be defined as a large biological community or an ecosystem where different types of living organisms including plants, animals, birds, insects, and humans are used to living in a certain type of climate.

Ecosystems are of two major types:
Terrestrial and aquatic. Terrestrial ecosystem can be further be classified into ‘biomes’.
A biome is a plant and animal community that covers a large geographical area.
The boundaries of different biomes on land are determined mainly by climate.
A biome can be defined as the total assemblage of plant and animal species interacting within specific conditions.
These include rainfall, temperature, humidity and soil conditions.
Some of the major biomes of the world are: forest, grassland, desert and tundra biomes.
Aquatic ecosystems can be classed as marine and freshwater ecosystems. Marine ecosystem includes the oceans, estuaries and coral reefs. Freshwater ecosystem includes lakes, ponds, streams, marshes and bogs.

•  They are very fertile due to the presence of alluvial soil.
•  The northern plains are formed by the deposits brought by the three major rivers and their tributaries.
•  The plain mostly comprise of flat land.
•  Northern plains are the world's most intensely farmed areas.
•  The Northern plains are also known as Great plains or Indo-Gangetic plains.

Theory of plate tectonics lays down that the crust of the Earth has been formed out of seven major and some minor plates. The movement of plates beneath the surface of the Earth creates tension resulting into folding, faulting and volcanic activities.

Areal differentiation represents one of the classic philosophical approaches to geographic inquiry. A central concept of areal differentiation is that the surface of the earth may be divided into regions, which may be distinguished and categorised using various spatial criteria. Thus, areal differentiation provides the theoretical foundation for regional geography, by conceptualising space as consisting of identifiable units that may be distinguished from one another on the basis of a set of phenomena or criteria. When there is similarity and dissimilarity among the physical and cultural features on the earth surface, it is called aerial differentiation.

A map is a representation or a drawing of the earth’s surface, or a part of it, on a flat surface, according to a scale. It could be hand drawn or printed. It helps us identify the places and locations within an area helping us to navigate from one place to another.

Maps are of several types.  They are mainly classified into:

• Physical or Relief Maps: These show natural features of the earth.
• Political Maps: These maps show the cities, town and villages, countries and states of the world with their boundaries.
• Thematic Maps: These maps focus on specific information like the map of a rainfall, roads, tourist places.

For all the odd answers you’ll get to this question, in practice… humans are nature. In fact, we’re the personification of nature and the reasons why we cause so much damage to the natural world are expressly because of that very point.

In the natural world, creatures, plants, or any form of life will expand to make use of all resources in their entirety, plus a bit extra beyond that. If there’s more food available, you will invariably get more and more deer until there’s too many deer to support, and then they’ll either be eaten by predators, or starve, or both. If there’s too many deer, this turns into there being more predators, but then with more predators, they do the exact same thing - they produce more predators than there are deer to support them, until they starve or get killed by other predators.

This is very much so the nature of evolution - procreation is based around making as many copies of yourself as possible which survive long enough to make more copies of themselves as well. The fittest creature for a given context will almost invariably produce more offspring which live longer than previous generations could manage, such as by having a mutation which allows it to survive on less food, or to run faster to catch prey or avoid predators, or any of a huge number of possibilities. The thing is though, that the very nature of evolution ensures that the creature will produce more than is sustainable, and then the less-fit versions of that creature will die off, and presumably the one which was most fit for the situation is all that’s left, causing a cycle of overpopulation and culling.

Humans do this exact same behaviour, except we do it better than other species are capable of due to our advanced tool usage, which is totally a natural trait. What’s the difference between a human dam and a beaver’s dam? The difference is a human dam is less likely to completely ruin the local ecosystem oddly enough. It’s a much bigger scale, but also has a much better grasp of the harm that can be dealt and so we add functionality to mitigate the harm done.

Geography is divided into two main branches: human geography and physical geography. There are additional branches in geography such as regional geography, cartography, and integrated geography.