At the time of the attack, Hiroshima was the headquarters of the 2nd General Army and 5th Division. It contained 40,000 Japanese soldiers within the city's limit, and was a beehive (or center) of war industry. The industry manufactured parts for planes and boats, bombs, rifles, and handguns. Children also were shown how to construct and throw gasoline bombs. and the heavy sick were assembling traps to be planted in the beaches of Kyushu. As with other Japanese cities, many of the strategic targets in Hiroshima were mixed with civilian homes and centers made of wood and paper. This made it harder to conduct a successful precision attack. And the highly inaccuracy of the bombing technology in World War II was owed to it. As a result, the city became the first nuclear weapon used against a target in history.
The bomb exploded over Hiroshima at 8:16 on the morning of August 6, 1945. Much of the city was destroyed. An estimated 70,000 persons were killed. 20,000 were Japanese soldiers and 20,000 were Korean slave laborers of all the kiled. Another 70,000 were injured. The bomb was nicknamed "Little Boy" after President Theodore Roosevelt. A building near the blast center still remains and is called the Atomic Bomb Dome.
Near to Hiroshima, there is a small island called Miyajima. The island is known for its deer. An old Shinto shrine named Itsukushima Shrine is also here. It is said that Itsukushima shrine was built at the end of the 5th century. The shrine is known for its use of red-colored wood, and especially for the "torii" gate. The gate leads into the shrine, which is partly underwater at high tide. Today, Itsukushima shrine and the Atomic Bomb Dome are registered as World Heritage sites. Also it was a landing site for the U.S.
Richter scale
The Richter scale is a scale of numbers used to tell the power (or magnitude) of earthquakes. Charles Richter developed the Richter Scale in 1935. His scale worked like a seismogram, measured by a particular type of "seismometer" at a distance of 100 kilometers (62 mi) from the earthquake.
Earthquakes 4.5 or higher on the Richter scale can be measured all over the world. An earthquake a size that scores 3.0 is ten times the amplitude of one that scores 2.0. The energy that is released increases by a factor of about 32.
Every increase of 1 on the Richter scale corresponds to an increase in amplitude by a factor of 10 so therefore, it is a logarithmic scale.
The earthquake with the biggest recorded magnitude was the Great Chilean Earthquake. It had a magnitude of 9.5 on the Richter scale and occurred in 1960. Around 6,000 people died because of the earthquake. No earthquake has ever hit 10+ on the Richter Scale.
Day
A day is the time it takes the Earth to spin around once. It is day time on the side of the Earth that is facing the Sun. When it is night time, that side of the Earth is facing away from the Sun. It takes 24 hours for the Earth to spin once, so that is one day, including the day time and night time. This is mean solar time, measured relative to the Sun. There is also sidereal time, measured relative to the fixed stars. The sidereal day is a few minutes shorter.
<nowiki>*</nowiki> There are only 29 days in February during a leap year. Otherwise, February has 28 days.
Phases of the Moon
The phases of the Moon are the different ways the Moon looks from Earth over about a month.
As the Moon orbits around the Earth, the half of the Moon that faces the Sun will be lit up. The different shapes of the lit portion of the Moon that can be seen from Earth are known as phases of the Moon. Each phase repeats itself every 29.5 days.
The same half of the Moon always faces the Earth, because of tidal locking. So the phases will always occur over the same half of the Moon's surface.
A phase is an angle of the moon to the earth so it appears differently every day.
The moon goes through 8 major phases.
A supermoon or Super Pink Moon takes place when moon's orbit is at its closest to the Earth. Supermoon take place each year between March and May. As Moon is exceptionally close to Earth; full Moon appears up to 7% larger and 15% brighter than a typical full moon. Traditionally any full moon that occurred in April was called a pink moon because it marked the blooming of Moss pink a wildflower.
Sphere
A sphere is a shape in space that is like the surface of a ball. Usually, the words "ball" and "sphere" mean the same thing. But in mathematics, a sphere is the surface of a ball, which is given by all the points in three dimensional space that are located at a fixed distance from the center. The distance from the center is called radius of the sphere. When the sphere is filled in with all the points inside, it called a ball.
Common things that have the shape of a sphere are are basketballs, superballs, and playground balls. The Earth and the Sun are nearly "spherical", meaning sphere-shaped.
A sphere is the three-dimensional analog of a circle.
The volume (formula_1) of a sphere is given by
where formula_3 is the radius of the sphere.
The surface area (formula_4) of a sphere is given by
where formula_3 is the radius of the sphere.
In Cartesian coordinates, the equation for a sphere with a center at (formula_7, formula_8, formula_9) is as follows:
where formula_3 is the radius of the sphere.
Quantity
Quantity or amount is how much of something there is that can be counted or measured.
Whole numbers (1, 2, 3 ...) are used to count things. This can be done by pointing to each one. As things are pointed to, a number is said. Start with the number one. Each time another thing is pointed to, the next whole number is used. When the last thing in a group it pointed to, that number is the quantity of the group.
Measuring is done with a ruler or a machine. We put a ruler next to a thing to measure how long it is. We put things on a scale to measure their mass. Other machines are used to measure other quantities such as temperature, speed, electric current, and so on.
When measuring things, a whole number might not be the best answer. A distance might be longer than 5 meters, but less than 6 meters. Meter sticks are marked off in parts of a meter. Decimals are formed by marking off a ruler in ten equal parts. Each part is a tenth. 5.2 meters is a little bit longer than 5 meters. 5.7 meters is a little bit shorter than 6 meters. Each of these tenths can be marked with ten smaller parts. The one hundred centimeters on a meter stick are done this way; by marking ten equal parts, then marking ten equal parts of each of those parts.
Fractions are used when there are parts of a whole number. The dial on a machine may be marked with four parts between each whole number. A scale with a bag of potatoes may show five and three-quarters kilograms. This would be almost six kilograms.
People often use the word "amount" when they should say "number". The words "number" and "amount" should be used if a particular number could be put: e.g.
Advertising
Advertising is how a company encourages people to buy their products, services or ideas. Advertising is one element of marketing, which also includes design, research and data mining.
An advertisement (or "ad" for short) is anything that draws good attention towards these things. It is usually designed by an advertising agency for a sponsor or brand and made public by various media. Ads appear on television, radio, newspapers, magazines and billboards in streets and cities. Advertisers use methods that attract attention.
Advertisers influence our emotions by techniques that include stereotyping and targeting the audience: who we are. Emotions are influenced by our occupation, beliefs, personality, self esteem, lifestyle, relationships, friends, how we look and what we wear.