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25 ноября 2024 01:58

Which is the only continent without glaciers?

Glaciers are present on every continent and approximately fifty countries, excluding those (Australia, South Africa) that have glaciers only on distant subantarctic island territories. Extensive glaciers are found in Antarctica, Chile, Canada, Alaska, Greenland and Iceland.

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23 ноября 2024 03:29

Which planet does not have a satellite?

Planets around other stars are likely to have natural satellites as well, although none have been observed. Of the inner planets, Mercury and Venus have no moons; Earth has one large moon, known as the Moon; and Mars has two tiny moons, Phobos and Deimos.

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20 ноября 2024 00:57

Which is the hardest bone in the human body?

The head of the femur articulates with the acetabulum in the pelvic bone forming the hip joint, while the distal part of the femur articulates with the tibia and patella forming the knee joint. By most measures the femur is the strongest bone in the body. The femur is also the longest bone in the body.

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18 ноября 2024 00:24

How do the atoms in a water molecule stick together?

Hydrogen Bonding. When water molecules align with each other, a weak bond is established between the negatively charged oxygen atom of one water molecule and the positively charged hydrogen atoms of a neighboring water molecule.

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16 ноября 2024 02:24

What kind of tree does paper come from?

Wood pulp comes from softwood trees such as spruce, pine, fir, larch and hemlock, and hardwoods such as eucalyptus, aspen and birch. A pulp mill is a manufacturing facility that converts wood chips or other plant fibre source into a thick fibre board which can be shipped to a paper mill for further processing.

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14 ноября 2024 00:39

Why does your body get the chills?

Chills (shivering) may occur at the beginning of an infection and are usually associated with a fever. Chills are caused by rapid muscle contraction and relaxation. They are the body's way of producing heat when it feels cold. Chills often predict the coming of a fever or an increase in the body's core temperature.

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12 ноября 2024 00:40

How long ago was the formation of the moon?

The moon was formed ~4.5 billion years ago, about 30–50 million years after the origin of the Solar System, out of debris thrown into orbit by a massive collision between a smaller proto-Earth and another planetoid, about the size of Mars.

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09 ноября 2024 00:21

Can camels swim in water?

Although camel is metaphorically described as the ship of the desert on account of its ability to negotiate the difficult terrain of long sand dunes for a long period of time without food or water, it cannot however swim in water. No, but they can float.

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07 ноября 2024 00:33

When was the first search engine invented?

The first few hundred web sites began in 1993 and most of them were at colleges, but long before most of them existed came Archie. The first search engine created was Archie, created in 1990 by Alan Emtage, a student at McGill University in Montreal.

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04 ноября 2024 22:44

What is your tongue attached to?

The hyoid is anchored by muscles from the anterior, posterior and inferior directions, and aids in tongue movement and swallowing. The hyoid bone provides attachment to the muscles of the floor of the mouth and the tongue above, the larynx below, and the epiglottis and pharynx behind.

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01 ноября 2024 01:07

Can you kill bacteria by freezing?

Freezing foods renders bacteria inactive but doesn't actually kill anything. That means if your food went into the freezer contaminated, once thawed it will still harbor the same harmful bacteria. Cooking it to the recommended temperature is the only way to ensure that your food is safe.

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29 октября 2024 02:59

How many teeth does an elephant have?

Elephants usually have 26 teeth: the incisors, known as the tusks, 12 deciduous premolars, and 12 molars. Unlike most mammals, which grow baby teeth and then replace them with a single permanent set of adult teeth, elephants are polyphyodonts that have cycles of tooth rotation throughout their lives.

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27 октября 2024 05:19

Do frogs have ears?

Frogs can hear both in the air and below water. They do not have external ears; the eardrums (tympanic membranes) are directly exposed or may be covered by a layer of skin and are visible as a circular area just behind the eye.

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24 октября 2024 01:55

What kind of animal is a platypus?

The platypus (Ornithorhynchus anatinus) also known as the duck-billed platypus is a semiaquatic egg-laying mammal endemic to eastern Australia, including Tasmania. Together with the four species of echidna, it is one of the five extant species of monotremes, the only mammals that lay eggs instead of giving birth.

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22 октября 2024 06:52

Is grass a monocot or a dicot?

Monocots: Plants with a single cotyledon or seed leaf. Leaf blades usually have parallel venation. Monocots may be grouped as grasses, sedges, or lilies.

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24 ноября 2024 04:26

Why does the moon control the tides?

The tides are due to the gravitational pull of the Moon and the Sun on the Earth. Because the gravitational force decreases as the distance squared, the part of the Earth that is closer to the Moon or the Sun is pulled a little extra and a bulge is created.

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22 ноября 2024 01:06

How much do all your bones weigh?

The total weight of your bones will depends on how much your entire body weighs. Your bones will make up about 15% of your total body weight. So if you weigh 100 lbs your bones weigh about 15lbs.

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19 ноября 2024 01:03

How many teeth does a cow have?

Cow's teeth are different from ours. On the top front, cows have a tough pad of skin instead of teeth. They have 8 incisors on the bottom front and 6 strong molars on the top and bottom of each side to grind their food. Cows have a total of 32 teeth.

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17 ноября 2024 03:34

Why are icebergs made of fresh water?

True icebergs are galcier fragments that have fallen into the sea. Glaciers are made of compacted smow, which is fresh water. Additionally, "sea ice" that forms from the freezing of sea water is also basically fresh water as well. This is because when saltwater freezes, it excludes salt from the ice crystal lattice.

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15 ноября 2024 00:53

Are the Atlantic and Pacific oceans the same level?

Sea level is about 20 cm higher on the Pacific side than the Atlantic due to the water being less dense on the Pacific side, on average, and due to the prevailing weather and ocean conditions. Such sea level differences are common across many short sections of land dividing ocean basins.

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13 ноября 2024 00:58

Is there a 4th degree burn?

When damage penetrates into some of the underlying layers, it is a partial-thickness or second-degree burn. In a full-thickness or third-degree burn, the injury extends to all layers of the skin. A fourth-degree burn additionally involves injury to deeper tissues, such as muscle or bone.

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11 ноября 2024 00:42

Why do lakes freeze from the top down rather than the bottom up?

The reason why ice forms on the top of lakes and ponds is that once water cools below 39 degrees Fahrenheit, it becomes lighter and less dense the more it cools. This means that water expands as it freezes into ice. As a result, ice takes up more room than the water it was made from.

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07 ноября 2024 23:35

What is the percentage of water in bones?

* The human body is more than 60 percent water. Blood is 92 percent water, the brain and muscles are 75 percent water, and bones are about 22 percent water. * A human can survive for a month or more without eating food, but only a week or so without drinking water.

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06 ноября 2024 00:30

Can graphite conduct electricity?

Graphite is an electric conductor, consequently, useful in such applications as arc lamp electrodes. It can conduct electricity due to the vast electron delocalization within the carbon layers (a phenomenon called aromaticity). These valence electrons are free to move, so are able to conduct electricity.

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04 ноября 2024 00:59

​​What is GPS? How does this work?

The Global Positioning System (GPS) is made up of satellites, ground stations, and receivers.
GPS is a system of 30+ navigation satellites circling Earth. We know where they are because they constantly send out signals. A GPS receiver in your phone listens for these signals. Once the receiver calculates its distance from four or more GPS satellites, it can figure out where you are.
Satellites act like the stars in constellations—we know where they are supposed to be at any given time.
The ground stations use radar to make sure they are actually where we think they are.
A receiver, like you might find in your phone or in your parents car, is constantly listening for a signal from these satellites. The receiver figures out how far away they are from some of them.
Once the receiver calculates its distance from four or more satellites, it knows exactly where you are.

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31 октября 2024 04:40

What country does the Sahara Desert cover?

Oases support some life forms in extremely arid deserts. The Sahara covers large parts of Algeria, Chad, Egypt, Libya, Mali, Mauritania, Morocco, Niger, Western Sahara, Sudan and Tunisia, extends over 9,000,000 km² (over 3,475,000 sq mi) and it covers about 1/4 of the African continent.

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28 октября 2024 11:02

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Today I Learn

25 октября 2024 02:28

What part of the body is known as the voice box?

The vocal folds, also known as vocal cords, are located within the larynx (also colloquially known as the voice box) at the top of the trachea. They are open during inhalation and come together to close during swallowing and phonation.

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23 октября 2024 06:03

How long does the food stay in your stomach?

After you eat, it takes about six to eight hours for food to pass through your stomach and small intestine. Food then enters your large intestine (colon) for further digestion, absorption of water and, finally, elimination of undigested food.

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21 октября 2024 03:54

When was glass first made?

Archaeologists have found evidence of man-made glass which dates back to 4000 BC; this took the form of glazes used for coating stone beads. It was not until 1500 BC that the first hollow glass container was made by covering a sand core with a layer of molten glass.

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