why do we need air in soil

why do we need air in soil

There are a number of reasons that it's important to have spaces of air in the soil. Here's a few of them: (1) Animals that live in the soil (like worms) and many types of bacteria that are important for other plants and animals need air to breathe. (2) Plants need air to breathe too - really! One of the ways that plants get air is by absorbing it through their roots. So if the plants couldn't get any air, they would actually suffocate. (3) Air spaces give plants (and animals) room to grow. If the soil is packed so tightly that there are no air spaces, it is more difficult for seeds to sprout and roots to grow. ...

 why do you get dizzy when you get up

why do you get dizzy when you get up

People requiring prolonged bed rest should sit up each day and exercise in bed when possible. People who are lying down or sitting should rise slowly and carefully. In general, it is helpful to consume adequate fluids, limit or avoid alcohol, and exercise regularly when feasible. Regular exercise of modest intensity increases the muscle tone in blood vessel walls, which reduces pooling of blood in the legs. Sleeping with the head of the bed raised may help relieve symptoms. For some people, increasing salt intake may increase water retention and lessen symptoms. Doctors may recommend that people increase their salt intake by liberally salting food or taking sodium chloride tablets. However, increasing salt intake may not be recommended for people with heart disorders. There are many

 why do we need to protect the wildlife

why do we need to protect the wildlife

There are a lot of wonders in the world and among them are wildlife species, such as bears, mountain goats, wolves, elk, and deer. Most people think that there is an abundance of wildlife species in the world, but the truth is, their numbers are dwindling and if nothing is done about it, these species might become endangered and extinct. Animals become endangered all the time and people are not aware about it. Thankfully, more and more preservation programs have been established to ensure that these animals are protected, bred, and well-taken care of. These preservation programs motivate and increase the awareness of the public regarding the proper management of natural resources. What Is Wildlife Conservation? Wildlife conservation is the attempt to protect endangered animal and plant

 why do the clocks go back in the uk

why do the clocks go back in the uk

It's that time of year again where we turn the clocks backwards and all get one hour more in bed! The clocks will be going backward on Sunday 29 October at 2am - so you will probably be fast asleep tucked up in bed when it happens. When the clocks change like this, we are moving from what is called British Summer Time (BST) - also known as Daylight Saving Time (DST) or GMT+1 - back to Greenwich Mean Time (GMT). In 2016 it was a particularly special year as it marked 100 years since we first changed our clocks like this. Once you've had a read about why we do this, have a go at our quiz at the end to see how much you've managed to remember. Whose idea was it to change the clocks? An American politician and inventor called Benjamin Franklin first came up with the idea while in Paris in

 why do you twitch while falling asleep

why do you twitch while falling asleep

A hypnagogic jerk is an involuntary muscle spasm that occurs as a person is drifting off to sleep. The phenomenon is so named in reference to the hypnagogic state the transitional period between wakefulness and. Hypnagogic jerks, are also commonly known as hypnic jerks or sleep starts. The muscle spasms may occur spontaneously or may be induced by sound, light or other external stimuli. Some people report hypnic jerks accompanied by hallucinations, dreams, the sensation of falling, or bright lights or loud noises coming from inside the head. [ Sleep starts are quite common, with some research suggesting that 60 to 70 percent of people experience them. Many individuals may be visited by nightly hypnic jerks without even knowing it, as the twitches often go unremembered, particularly if

 why do writers use different types of sentences

why do writers use different types of sentences

One of the trickiest patterns to spot is that of repetitive sentence type. Just like subject and length, overusing a sentence type can hinder a reader s engagement with a text. There are four types of sentences: simple, compound, complex, and compound-complex. Each sentence is defined by the use of independent and dependent clauses, conjunctions, and subordinators. Simple sentences: A simple sentence is an independent clause with no conjunction or dependent clause. Compound sentences: A compound sentence is two independent clauses joined by a conjunction (e. g. , and, but, or, for, nor, yet, so). Complex sentences: A complex sentence contains one independent clause and at least one dependent clause. The clauses in a complex sentence are combined with conjunctions and subordinators, terms

 why do you need fluoride in toothpaste

why do you need fluoride in toothpaste

Interviewer: Natural toothpaste, you know the kind that doesn't have fluoride? Does it work? We're going to find out next on The Scope. Announcer: Health tips, medical views, research and more for a happier, healthier life. From University of Utah Health Sciences, this is The Scope. Interviewer: Dr. David Okano is a periodontist with 30 years of experience and currently an assistant professor at the University of Utah School of Dentistry. It seems like when you go down the toothpaste aisle now, you're starting to see more and more natural options and a lot of those have no fluoride in them. Are those toothpastes effective? Dr. Okano: In terms of prevention of tooth decay, no. The only benefit that you'll gain is a fresher mouth with the natural toothpaste, but you will not receive any

 why do we need hair on our body

why do we need hair on our body

We're a pretty resourceful species, but when it comes to body parts, humans definitely have a couple that seem like a waste of space. After all, we could do perfectly well without the appendix, male nipples, and our wisdom teeth, and scientists think these could simply be a hangover from our evolutionary past. But what's the point of all that hair on our bodies, and why do we have eyebrows anyway? The of the University of New South Wales' (UNSW) How Did We Get Here explains. For starters, even though we might consider ourselves pretty hairless, humans are actually covered in around five million hair follicles - tiny organs on our skin's surface that produce hair. In fact, after our heads, the area with the highest concentration of hair is our nostrils. But why aren't we as hairy as our

 why do we use letters in algebra

why do we use letters in algebra

It may help you to read first An equation says that two things are equal. It will have an equals sign = like this: That equation says: what is on the left (x + 2) is equal to what is on the right (6) So an equation is like a statement this equals that So people can talk about equations, there are names for different parts (better than saying that thingy there! ), and all its parts: A Variable is a symbol for a number we don't know yet. It is usually a letter like x or y. A number on its own is called a Constant. A Coefficient is a number used to multiply a variable ( 4x means 4 times x, so 4 Variables on their own (without a number next to them) actually have a coefficient of 1 ( x is really 1x Sometimes a coefficient is a letter like a or b An Operator is a symbol (such as +, etc) that