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You can write the ratio between the two numbers 5 and 7 as 5:7 or as 5 If you think the second form looks like a fraction, you’re right. It’s also a rational number, because it’s a quotient, or ratio,…
If you have the sneaking suspicion that the local climate has been changing over the past few years, calculating the mean annual temperature will help dispel the mystery. The mean annual temperature refers to the average of the maximum and…
Climate plays a definitive role in the breakdown of rocks into soils and sediment, a process known as weathering. Rocks found in equatorial climates and exposed to lots of rain, humidity and heat break down or weather faster than similar…
A combustible substance can burn, and if nitrogen could burn, all life on earth would have been destroyed long ago. Nitrogen gas makes up some 78 percent of the earth’s atmosphere. Roughly 21 percent of the atmosphere is oxygen, and…
The current in an alternating current circuit varies continuously in direction and magnitude. Calculations involving the current don’t therefore consider the current at any single instant. They instead use the root mean square current, a value that takes into account…
All living things are connected, especially when it comes to eating and being eaten. Food chains and food webs are ways of showing the food relationships between organisms in any given environment, from the African savanna to the coral reef.…
Though often referred to as a plant or rock because of its appearance, coral is a living animal. Coral comprises tiny polyps that divide asexually to form the colonies off of which marine life tends to feed. Many organisms hide…
From the Galapagos Islands to Antarctica, penguins encounter threats from predatory birds, marine mammals and sharks. Penguins in large colonies create a formidable defense against these predators by their sheer numbers, as do their swimming skills which include underwater maneuverability,…
Glow-in-the-dark items are all around us, whether as the stars on the ceiling of our children’s bedrooms or a painted Halloween costume. Whether flipping a wrist in a darkened theater to check the time, or snapping a glow stick at…
A telescope lets you observe celestial objects in the night sky in extraordinary detail. Vivitar manufactures refractor telescopes that include everything you need to begin observing the wonders of the night sky. Refractor telescopes use a two-lens optical system to…
