Earth science, 14–17 years — 20 topics · MyLeoNes™ Kuks
20 earth science topics written for 14–17 years — not a older text simplified. In teaching order, each a deck of five cards: the idea, why it exists, a worked example, the common trap and where you meet it.
Earth science · 14–17 years
How plate tectonics works
Earth’s outer shell is broken into moving plates. Their slow movement builds mountains, opens oceans and causes many earthquakes and volcanoes.
How earthquakes release energy
Stress can build where rocks are locked along a fault. When they suddenly slip, energy travels through Earth as seismic waves.
The rock cycle
Rocks do not belong permanently to one type. Heat, pressure, melting, cooling, weathering and burial can transform the same material over geological time.
The greenhouse effect
Certain gases slow the escape of infrared energy from Earth. The natural effect keeps the planet habitable, while extra greenhouse gases strengthen it and raise the average temperature.
The water cycle
Water is constantly moving between the ground, oceans, living things and the atmosphere. The same water can freeze, flow, evaporate and fall as rain many times.
Weathering and erosion
Rocks can break apart where they are, then their pieces can be carried elsewhere. These two processes help turn solid landscapes into soils, valleys and sediments.
Air pressure and wind
Uneven heating makes air pressure differ from place to place. Air moves from higher pressure towards lower pressure, and Earth’s rotation changes the path of that movement.
Weather fronts
A weather front is a boundary where air masses with different temperatures and moisture meet. The way one air mass moves over or pushes under the other helps predict clouds, rain and changing temperatures.
How volcanoes form
Magma does not rise randomly: its movement, pressure and gas help explain where eruptions happen and what they produce.
Minerals and crystal structure
Minerals are the ordered ingredients of most rocks. Their atoms, properties and formation conditions help explain why rocks look and behave differently.
Groundwater and aquifers
Water below ground is not usually an underground lake. It moves slowly through pores and cracks, and aquifers store and supply water to people and ecosystems.
How ocean currents move heat
Ocean water moves in large patterns driven by wind, Earth’s rotation, temperature and salt. These currents redistribute heat and affect nearby climates without controlling every weather event.
Earth’s layers
Earth is not the same all the way down. Its layers differ in material, temperature and behaviour, and scientists use earthquakes to infer what cannot be reached by drilling.
Why seasons happen
The seasons are caused mainly by Earth’s tilted axis as it travels around the Sun. The tilt changes the angle and length of sunlight, rather than Earth simply moving much nearer to or farther from the Sun.
How tides work
Tides are regular changes in sea level caused mainly by the Moon’s gravity, with help from the Sun. Earth’s rotation and the shape of coastlines turn this force into the local pattern people observe.
Fossils and geological time
Fossils are evidence of past life or past biological activity preserved in rocks. By comparing layers, fossil types and numerical ages, geologists reconstruct changing environments across Earth’s immense history.
The carbon cycle
How carbon moves between the air, living things, rocks, oceans and soil.
Earth’s magnetic field
How moving metal deep inside Earth creates a shield and a compass direction.
El Niño and La Niña
How unusual Pacific Ocean temperatures can change weather far away.
Ocean acidification
How extra carbon dioxide changes seawater chemistry and affects shells and reefs.
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