A diagram is a symbolic representation of information using visualization techniques. Diagrams have been used since ancient times on walls of caves , but became more prevalent during the Enlightenment. Sometimes, the technique uses a three-dimensional visualization which is then projected onto a two-dimensional surface. The word graph is sometimes used as a synonym for diagram.

The term "diagram" in its commonly used sense can have a general or specific meaning:

visual information device : Like the term "illustration", "diagram" is used as a collective term standing for the whole class of technical genres, including graphs, technical drawings and tables.

The narrator goes to 46, Marconi Street because she wants to get back the things that belonged to her mother, Mrs S. Before war , they have given those things to Mrs . Dorlings so as to keep them secure and safe. After the war , the narrator came to Mrs. Dorlings house ( 46, Marconi Street ) so as to get those precious things of her mother back.

Teachings of Islam:

• God, i.e. Allah is one. He is omnipresent and omnipotent.
• People should lead a simple life.

A new religion emerged which drew widespread adherence amongst the Arab population. A new and vigorous state emerged bringing peace to the warring tribes of Arabia. Expansion provided a common task for the Arab community, which reinforced the fragile unity of the umma. Muslim conquests following Muhammad's death led to the creation of the caliphates, occupying a vast geographical area; conversion to Islam was boosted by missionary activities, particularly those of imams, who intermingled with local populations to propagate the religious teachings.

An account is said to have a credit balance if the total of its credit side is more than the total of its debit side.

A debit balance is an account balance where there is a positive balance in the left side of the account. Accounts that normally have a debit balance include assets, expenses, and losses. Examples of these accounts are the cash, accounts receivable, prepaid expenses, fixed assets (asset) account, wages (expense) and loss on sale of assets (loss) account. Contra accounts that normally have debit balances include the contra liability, contra equity, and contra revenue accounts. An example of these accounts is the treasury stock (contra equity) account.

Pangaea formed through a gradual process spanning a few hundred million years. Beginning about 480 million years ago, a continent called Laurentia, which includes parts of North America, merged with several other micro-continents to form Euramerica. Euramerica eventually collided with Gondwana, another supercontinent that included Africa, Australia, South America and the Indian subcontinent.

Earth crust is the thinnest and the most rudimentary layer that makes up the Earth, and yet, everything that has ever lived on Earth has called it home. The crust is a dynamic structure and it is one of the layers that make up our pale blue dot. The crust is referred to as a chemical layer that has varying chemical compositions. 

The temperature within the Earth is very high, because it has very much humidity, hot lava. This causes the rocks also becomes hot called magma. There are three main sources of heat in the deep earth: (1) heat from when the planet formed and accreted, which has not yet been lost; (2) frictional heating, caused by denser core material sinking to the center of the planet; and (3) heat from the decay of radioactive elements.

When we go inside the earth a pressure is exerted because of the gas particles in the air—like particles of all fluids—are constantly moving and bumping into things, they exert pressure. The pressure exerted by the air in the atmosphere is greater close to Earth's surface and decreases as you go higher above the surface.

The pressure in the Earth's inner core is slightly higher than it is at the boundary between the outer and inner cores: it ranges from about 330 to 360 gigapascals.

Pressure also increases in the outer core due in part to the weight of the crust and mantle above. The Earth's magnetic field is generated by the outer core.

The density of the Earth is 5.513 g/cm³. This is an average of all of the material on the planet. Water is much less dense than iron, hence an average is needed for ease of use. Earth is the most dense planet in the Solar System; however, if gravitational compression where factored out, the second most dense planet, Mercury, would be more dense. 

The following are the immediate hazardous effects of Earthquake:

• Shaking of ground
• The disparity in ground settlement
• Natural disasters like Tsunami, landslide, mudslides, and avalanches
• Soil liquefaction
• Ground lurching and displacement
• Floods and fires
• Infrastructure collapse.

The motion of a rigid body which takes place in such a way that all of its particles move in circles about an axis with a common angular velocity; also, the rotation of a particle about a fixed point in space. Rotation around a fixed axis or about a fixed axis of revolution or motion with respect to a fixed axis of rotation is a special case of rotational motion. The fixed-axis hypothesis excludes the possibility of an axis changing its orientation and cannot describe such phenomena as wobbling or precession.

It is given that, the demand for a commodity increases from 100 units to 200 units when the price of that commodity decreases from 12 to 10 Rs.

We have to find the Elasticity of Demand.

The percentage change in price = (change in price / original price ) X 100

= (2 / 12) X 100

= 16.67%

The percentage change in quantity = (change in quantity / original quantity ) X 100

= (100 / 100 ) X 100

= 100%

The elasticity of demand = % change in quantity / % change in price

= 100 / 16.67  

= 5.99

The elasticity of demand is 5.99.

The elasticity of demand comes after dividing the percentage change in quantity with the percentage change in price. Thus, the elasticity of demand is 5.99.

A chemical substance is a form of matter having constant chemical composition and characteristic properties. Some references add that chemical substance cannot be separated into its constituent elements by physical separation methods, i.e., without breaking chemical bonds.

This usually occurs in organic chemistry . Take acetic acid and formaldehyde and glucose.  

Acetic acid = CH3COOH - C2H4O2 Empirical formula = CH2O  

Formaldehyde = CH2O  

Glucose C6H12O6 = empirical formula = CH2O

Butene= molecular firmula is C4H8 but its empericsl formula is CH4

A unit is an internationally accepted standard for measurements of quantities.

• Measurement consists of a numeric quantity along with a relevant unit.
• Units for Fundamental or base quantities (like length, time etc.) are called Fundamental units.
• Units which are combination of fundamental units are called Derived units.
• Fundamental and Derived units together form a System of Units.

A Nation State refers to a country with well defined delineated boundaries, resided by people with a similar culture, shared history and ethnic character. It is also supposed to have a government of its choice. The people in a Nation State are supposed to have unity, strength and cooperation.