Ionic compounds held together by ionic bonds as classed as ionic compounds. Elements can gain or lose electrons in order to attain their nearest noble gas configuration. Formation of ions (either by gaining or losing electrons) for the completion of octet helps them gain stability.

Scientists believe that agriculture was established first in the Fertile Crescent of the Middle East about ten or eleven thousand years B.C.E. The region was home to a variety of edible and easily cultivated crops: wheat and barley among the cereal crops, and lentils, peas, and chickpeas among the vegetables.

Groundwater flow rates are controlled by the permeability of the aquifer through which the water is flowing and by the local hydraulic gradient (the drop in hydraulic head per unit distance; equal to the slope of the water table for unconfined aquifers). Groundwater supplies drinking water for 51% of the total U.S. population and 99% of the rural population. Groundwater helps grow our food. 64% of groundwater is used for irrigation to grow crops.

The density of material shows the denseness of that material in a specific given area. A material’s density is defined as its mass per unit volume. Density is essentially a measurement of how tightly matter is packed together. It is a unique physical property for a particular object. The principle of density was discovered by the Greek scientist Archimedes.

We know that all living things be it plants and animals need food and water to live on. We need food because food gives us energy.
Food we eat gives our body essential nutrients to help us grow and heal when we are injured or we are ill.
Thus food keeps us healthey and provide us essential nutrients to fight diseases.

Herbivores are animals that have adapted to eat autotrophs: organisms that can produce their own food, such as through light, water, or chemicals like carbon dioxide. Autotrophs include plants, algae, and some bacteria.

Herbivores come in all shapes and sizes in the animal kingdom. They include insects and aquatic and non-aquatic vertebrates.Herbivores are eaten by carnivores (animals that eat other animals) and omnivores (animals that eat both plants and animals). They are found somewhere in the middle of the food chain

Stitching was not known in earlier times. So people draped fabrics around different parts of their body. The stitching of clothes began with the invention of sewing needles. Yes, we still wear unstitched fabrics such as saree, dhoti and turban.

No, all living beings do not need the same kind of food. Some animals eat only plant products called as herbivores. Some animalseat only other animals. They are called carnivores. Some other animals eat both plants and animals called omnivores.

Rectilinear Motion – This is a motion where objects move along a straight line. Examples march past of soldiers, sprinters in race, falling stones etc.
Circular Motion - This is a motion where objects move along a circular path. Examples hands of a clock, blades of a fan, rotation of earth around the sun etc.A type of circular motion where an object spins on its own axis, it is called rotational motion. Example rolling ball, spinning top etc.

Saturn has 53 moons that have been named. Saturn also has 29 moons awaiting confirmation. They’re unconfirmed because we’re waiting to get more information about them. If all of these moons get confirmed, Saturn will have 82 moons. And that’s not counting Saturn’s beautiful rings.

The principle involved in centrifugation is that the denser particles are forced to the bottom and the lighter particles stay at the top when spun rapidly.  A milk churner used in the kitchen works on the same principle.

Centrifugation of a solid-liquid mixture depends on:
(i) the density of the particles
(ii) viscosity of the medium and
(iii) the speed of rotation.

The machine used for centrifugation is called a 'centrifuge'. It consists of a test tube holder called rotor.

Take milk in test tube fix the test tube to the tesdt tube holder.On rapid rotation of the rotor, a centrifugal force develops  and  forces the more denser(milk) particles to settle at the bottom of the tube while less denser particles (butter)at the top.

People of different states in India consume different types of food because of different climatic conditions and natural vegetation. For example - Southern India (and some eastern states) is more rice based and being bounded by sea,has more focus on fishes/meats etc as compared to northern India.

Fabric is cloth or other material produced by weaving together cotton, nylon, wool, silk, or other threads. Fabrics are used for making things such as clothes, curtains, and sheets.

VOLUME MEASURES THE AMOUNT OF SPACE THAT A SUBSTANCE OR AN OBJECT TAKES UUP. THE BASIC SI UNIT FOR VOLUME IS THE CUBIC METER (m³).

Poles are the places on the magnet where pull of the magnet is the strongest. A magnet has always two poles. The two poles of the magnet are near its free ends. One pole of the magnet is called north pole and the other pole of the magnet is called south pole.

The same type of magnetic poles are called like poles whereas the different types of magnetic poles are called unlike poles.

The water cycle, also known as the hydrologic cycle or the hydrological cycle, describes the continuous movement of water on, above and below the surface of the Earth.

During this process, water changes its state from one phase to another, but the total number of water particles remains the same. In other words, if it were possible to collect and boil 100 gms of water, it will still retain a mass of 100 gms as steam. Likewise, if 100 gms of steam is collected and condensed, the resultant water would still weight 100 gms.

Water changes its state through a variety of processes from evaporation, melting and freezing, to sublimation, condensation, and deposition. All these changes require the application of energy.

Ingredients are the materials required to prepare the dish we consume as food.
Example
To prepare vegetable curry, we need different kinds of vegetables, salt, spices, oil

A chemical equation is the symbolic representation of a chemical reaction in the form of symbols and formulae, wherein the reactant entities are given on the left-hand side and the product entities on the right-hand side. The first chemical equation was diagrammed by Jean Beguin in 1615. A balanced chemical equation occurs when the number of the atoms involved in the reactants side is equal to the number of atoms in the products side. In this chemical reaction, nitrogen (N2) reacts with hydrogen (H) to produce ammonia (NH3). The reactants are nitrogen and hydrogen, and the product is ammonia.