Lake and river are both bodies of water. The main difference between a river and a lake is the size, shape and movement. Rivers looks like snakes slithering away, whereas lakes are more like huge puddles of water. Rivers are always moving, whereas lakes for general purposes are stationary.

24k means that the gold includes 99.0 percent to 99.9 percent of pure gold, whereas 22k gold refers to gold with around 91 percent of pure gold and rest is impurities mixed with the gold.

Stalactites are found hanging from the roof of the cave. Stalagmites are formed from the ground up and are pointed figures that rise from the ground.

White gold jewelry has become quite popular over the last few decades. This is mainly because it has the look of platinum and titanium, however costs much less than those metals. White gold is usually coated with rhodium, which gives it a nice shine. In its pure form, platinum is a soft metal and hence is very malleable, similar to gold. However, unlike gold, platinum is very heavy, up to one third heavier than 18 karat gold. Platinum costs approximately twice or two and a half times as much as gold, depending on its purity.

Iron is a chemical element that is found in abundance in the Earth’s crust. Steel is an alloy, meaning it is a mixture of two of more metallic elements or one metallic and nonmetallic element.

A tidal wave is essentially a high tide that rises fast enough to appear in the form of a wave. It is solely affected by weather and the gravitational pull from the moon and sun. A tsunami, on the other hand, occurs when some event disturbs the ocean. They are usually caused by a geological event, such as an earthquake, volcanic eruption, or landslide.

Surface water is the water that is found on the surface of the Earth, such as lakes, ponds, oceans, etc. Ground water is water that has been seeped and stored into the ground.

Rocks are formed from minerals or mineroids solidified into one. A rock could be made up of either one or more than one minerals combined together. Minerals are homogenous solids that have regular structures and are found in rocks, ore and mineral deposits in the earth’s crust.

White Gold is white in color and is plated with rhodium, in order to make it appear brighter and more silver in appearance. Yellow Gold is yellow in color and lacks the hardness of white gold.

Tides are the rise and fall of sea level that is caused by the gravitational pull of the moon and the sun on the Earth. Waves are actually energy that moves across the surface of the water. In the scientific community, this is more commonly known as wind waves as these waves are generated by wind.

Geology is the scientific study of solid Earth, though it can also refer to any other celestial body, the rocks of which it is composed, and the processes by which they evolve. It includes studying both the solid and liquid forms that exist on the planet. The composition of the planet, along with its crust and physical components are a part of geology. Ecology is the study of living organisms and their relationship with other organisms and their habitat. It seeks to answer questions such as the composition, distribution, amount (biomass), number, and changing states of organisms within and among ecosystems.

Gemstones are rare pieces of minerals that are found in the ground, which are then cut and polished to be used in jewelry and other decorative pieces. Crystals are pure substances whose atoms, molecules, or ions are arranged in an ordered pattern, where they extend in all three spatial dimensions. A gem can be a crystal, while a crystal cannot be called as a gem.

Crystals are pure substances whose atoms, molecules, or ions are arranged in an ordered pattern, where they extend in all three spatial dimensions. Minerals are homogenous solids that have regular structures and are found in rocks, ore and mineral deposits in the earth’s crust.