One of the best known buildings in the world, this is the residence and office of the President of the United States.
A hydrothermal vent is a fissure in the planet's surface through which geothermally heated water erupts.
Mitosis is the process by which a eukaryotic cell divides into two cells and the number of chromosomes remains unchanged.
Practice the Hungarian alphabet and form words from the letters.
Water on Earth is in a continuous state of change. The water cycle includes processes such as evaporation, precipitation, melting and freezing.
Vertical forces can break up layers of rock into fault blocks, which then move vertically along the fracture planes.
Tectonic plates can move in relation to each other.
Lateral compressive forces cause rocks to form folds. This is how fold mountains are formed.
The rise and drop of sea levels caused by the gravitational force of the Moon.
Carbon is bound in organic substances during photosynthesis, while during breathing, it is released into the atmosphere.
Dry land on the surface of Earth is divided into continents which are separated by oceans.
Mechanical bell that functions by means of an electromagnet.
When the Sun, Earth, and the Moon are arranged in a straight line, the Moon can partially or completely obscure the Sun.
Cannons also appeared in naval warfare.
This animation demonstrates the most important relief features, surface waters and their relevant symbols.
Lunar eclipses occur when the Moon passes through the shadow cone of Earth
The Earth is a rocky planet with a solid crust and oxygen in its atmosphere.
Matter is made up by quarks and leptons, while interactions are carried by bosons.
The huge dam built on the Colorado river in the US was named after a former American President.
A dynamo converts mechanical energy into direct current.