Division of space by three intersecting planes in several different arrangements.
Water turbines convert the kinetic energy of water into electric current.
A hot air balloon is a balloon aircraft which is lifted by hot air.
Red deer are even-toed ungulates, ruminants. Their males have spectacular antlers.
Cyclones are large areas of circulating air with clouds and precipitation being formed in its centre.
Surface epithelia cover the external and internal surfaces of the body
The reproductive system consists of organs which work together for the purpose of reproduction.
This animation demonstrates the anatomy of birds through the example of mallards.
Two meshing gears transmit torque during their rotational motion.
Regular dice can be used for solving statistical and probability exercises.
Freshwater fish used as food in many parts of the world.
Polypeptide chains are composed of amino acids and can appear in alpha-helix or beta-sheet form.
Types of bridges include beam-, arch-, suspension-, cantilever and truss bridges.
A type of snake with a characteristic spot on its neck.
Cold and warm fronts are formed where bodies of cold and warm air meet.
Domesticated animals and crops originate from various parts of the world.
This animation demonstrates how solar energy can be utilised.
In summer, monsoon winds bring heavy rainfall from the ocean to the continent.
The reproductive system is a series of organs working together for the purpose of reproduction.
The anatomy of annelids is demonstrated through the example of the common earthworm.