What is Mining? Process of extracting valuable minerals from the earths surface. Formations in Which Minerals Occur i) Veins and Lodes – Occurrence of minerals in crevices, cracks or faults in igneous rocks. ii) Reef – Veins and lodes which
Minerals -Inorganic substances occurring naturally at or below the earth’s surface. Characteristics of Minerals Types of Minerals Rocks – A consolidated material composed of grains of one or more minerals. Classification of Rocks 1. Igneous Rocks -Rocks formed when molten
What is Weather? Weather is the daily atmospheric condition of a place at a particular time. The elements of weather are: A Weather Station A place where observation, measuring and recording of weather elements is done. Factors to Be Taken
The Sun It’s the centre of the universe. Characteristics of the Sun – It is a starA star is a heavenly possessing its own light which it transmits. Nebula/galaxy is a cluster of stars. The earth is in a galaxy called The Milky Way.– It’s
Introduction to the Solar System – Solar system is the group of heavenly bodies comprising the sun and the nine planets. The origin of the Solar System – Definition: A theory is a set of reasoned ideas intended to explain facts or
Introduction to Geography – It is defined as the scientific study of the earth as a home of man.– Study of interrelationship on natural and human phenomena on the earth’s surface. Environment – Defined as the surroundings– Refers to all
Introduction to Radioactivity – Radioactivity was discovered by Henri Becquerel in 1869. In 1898, Marie and Pierre Curie succeeded in chemically isolating two radioactive elements, Polonium (z=84) and Radium (z=88).Radioactivity or radioactive decay is the spontaneous disintegration of unstable nuclides to form stable ones with
Introduction to Photoelectric Effect – Photoelectric effect was discovered by Heinrich Hertzin 1887.Photoelectric effect is a phenomenon in which electrons are emitted from the surface of a substance when certain electromagnetic radiation falls on it.– Metal surfaces require ultra-violet radiation
What are X-rays? – X-rays were discovered by a German scientist namedRoentgen in 1985.– They can pass through most substances including soft tissues of the body but not through bones and most metals.– They were named X-rays meaning ‘unknown rays’.
What is a Cathode Ray? These are streams of electrons emitted at the cathode of an evacuated tube containing an anode and a cathode. Production of Cathode Rays They are produced by a set up called a discharge tube where a high
Translation is a process by which ideas that are written in one language ar...
Are the abilities that allow you to write effectively and concisely. A competent...
Reading is the process of going through written information or piece of wor...
What is Speaking? SPEAKING SKILLS: Speaking is simply the act of talking wh...
Listening is ability to accurately receive and interpret messages in the communi...
This is the field or branch of morphology which studies different principles or ...
Language is a symbol system based on pure or arbitrary conventions…...
Ecology is the study of the interactions between living things, such as humans, ...
EVOLUTION Evolution is a change in the genetic composition of a population...
Genetics is the study of heredity and variationHeredity- is the passage of chara...