How does the weather change?
Unlike climate, weather depends on the seasons and can also change anytime. Meteorologists predict in the evening how the weather will be the next day. The weather is driven by the sun, which heats up the ground and the water surfaces. Evaporated water creates clouds from which thunderstorms build up, and the ensuing bursts of thunder and lightning make us flinch. Every time a cyclone hits the tropical regions, lashing rain sends people running for cover.
How did the ice age occur?
What is the impact of ocean currents on climate?
What is a trade wind?
What is climate?
Why is sand of different types?
Sand is not a rough mixture of various rock particles, but a granular material. The size of a sand particle ranges from approximately 0.02 mm to 2 mm. The appearance of the sand particles depends on the rock from which they were formed by erosion. Black sand is made from volcanic rock, and oatmeal sand from quartz and feldspar grains. Red sand contains a lot of iron-rich minerals, which are frequently found in sandstones, and white sand is mostly composed of small, grated seashells, snails or the chalk from coral reefs. If a rock containing gold erodes, the gold particles are freed and get stored in rivers. Such findings led to the so-called gold rush in 1848 in California.