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Static electricity is the accumulation of electric charges on the surface of an object when the charges are at rest and do not flow as an electric current. It occurs due to the transfer of electrons from one object to another.
The word “static” means stationary or not moving.
Examples include:
Hair standing up after rubbing with a balloon
Clothes sticking together
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Sustainable use means using resources to meet present needs without reducing the ability of future generations to meet theirs.
Biological resources (forests, fisheries) can regrow.
Rocks and minerals are non-renewable, so they will eventually run out.
Rocks and minerals are finite resources.
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Definition:- A rapid growth of microscopic algae in water, often resulting in à coloured scum on the surface.
An algal bloom is a rapid, excessive growth of algae in fresh water or marine environments, often turning the water discoloured (green, red, brown) due to high nutrient levels, especially nitrogen and phosphorus from fertiliser runoff or wastewater.
These blooms can be harmless but are often harmful, causing oxygen depletion (hypoxia) that kills fish and other aquatic life.
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1) Introduction:
A) Definition:- Pollution is the introduction of harmful substances or energy (like - heat, sound, light) into the natural environment, causing adverse effects on living organisms and ecosystems, making the surrounding impure and unsafe.
B) Causes:- Pollution stems rein hunan activities like burning fossil fuels for energy and transport; industrial emission, vehicle exhaust, agricultural chemicals (pesticides/fertilisers), and improper waste disposal (sewage, plastic, garbage burning).
2) Causes of water pollution:
A. Factories:- Factories cause water pollution by discharging untreated waste water filled with toxic chemicals, heavy metals (like-led, mercury) dyes, oils, and pathogens into rivers, lakes, and groundwater.
B. House hold works:- House holds pollutes water through untreated sewage release, poor drainage systems, and ground water sewage.
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All living organisms—whether plants or animals, single-celled or multicellular—show seven basic characteristics. These can be remembered using the mnemonic MRS GREN.
Movement is an action by an organism or part of an organism.
It causes a change in position or place.
Example: humans walking, plants bending towards light.
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The skeletal system is the framework of bones in our body. It gives our body shape, support, and protection.
Skull – Protects the brain
Spine (Backbone) – Helps us stand straight and bend
Rib Cage – Protects the heart and lungs
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The Earth is made of 3 main layers:
1. Crust.
The outer layer.
Thin and solid.
Where we live.
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The Earth is made of 3 main layers:
1. Crust.
The outer layer.
Thin and solid.
Where we live.
