Saturday, May 1, 2010
Reflection
Wednesday, April 28, 2010
Reflection by maggy
Friday, April 23, 2010
Balanced diet
The food we eat is very important. We all eat if we are hungry or even sad. But, the kind of foods we eat are important. The way we eat, starting from the ammount or types affects us physically and health wise. To be healthy, we need to eat a balanced diet and exersise. What is a balanced diet?
What is a balanced diet?
It is a diet with the ammount and variety of food needed for good health. It helps us to avoid diseases or risks like:
- obesity
- heart disease
- diabetes
- cancer
This balanced diet much include:
- carbohydrate
- protein
- fat
- vitamins
- mineral salts
- fibre
Even though we have all these, we must also have them in the right ammount. We should not have too much proteins or little fibre. If eaten in the right ammount, it actually does help or benefit us.
What is Carbohydrates?
Cabohyrates are the source of energy. Most cabohydrates are in form of starch. Starch is found in foods such as:
- cereal
- yams
- bread
- rice
- potatoes
- spaghetti and others.
Then after having starch, our digestive system turns it to another cabohydrate called Glucose. Glucose is caried around the body with the blood and it is used by our tissues as a source of energy. Any glucose is absorbed without any need for digestion and that is why we see id one is from running and has no energy is given glucose because it will provide energy rightaway.
What is protein?
Proteins are required for growth and repair. Our muscles, your organs, and your immune system are made up mostly of protein.They are very large molucles so they cannot get directly into our blood like carbohydrates. The digestive system turns the into amino-acids. There 20 different types of amino acides in our bodies. Our cells get their amino-acids from the blood. Protein helps in our groth and to repair any damaged part like a cut. They can also provied energy but not much. proten is found in foods such as:
- beef
- poultry
- fish
- eggs
- dairy products
- nuts
- seeds
What are fats?
Fats also provide energy and they are storebenith our skin to keep us warm.
http://www.purchon.com/biology/diet.htm - April 23rd 2010
Thursday, April 22, 2010
Social Networks
1.Personal Touch
Social networks allow organizations to reach out to select groups or individuals and to target them personally. Businesses can encourage their customers to become connections or friends, offering special discounts that would be exclusive to online contacts. This personal touch is not only appreciated but may give the business access to that customer’s own network of contacts.
2. Low-Cost Marketing
Once social networks have become established and people become familiar with the brand, businesses can use the sites or applications to implement marketing campaigns, announce special offers, make important announcements and direct interested people to the specific Web sites. It is mostly free advertising, and the only cost to the business is the time and effort required to maintain the network and the official Web site.
Connecting with prospects on a personal level builds trust and credibility. A general rule of thumb is to offer your services, expertise or help before you ask for it. It is acceptable to promote your services when asked. If you're not careful, your attempts could be considered spam. Instead, wait for the opportunities to present themselves instead of forcing a situation.
- Cyber-bullying and harassment are most often perpetrated by other teens and tend to happen most to older girls and to teens of either gender who have a strong online presence. It may take several forms:
publicizing private instant messages, text messages or e-mails
posting threatening messages
posting photos that will cause embarrassment
spreading rumors - invasion of privacy
- potential to lure child predators and other criminals
- wasting time (often why schools/governments block access)
- Scams and Harassment
There is a potential for failure of security in both personal and business context. While many sites apply certain measures to keep any of these cases of harassment, cyber-stalking, online scams, and identity theft to an absolute minimum, you still may never know.
sources:http://thetechedition.com/advantages-and-disadvantages-of-social-networking-sites/
Wednesday, April 21, 2010
Volcanoes
If simpler,these diagrams will explain more on how a volcano occurs;
The ordinary volcanoes can be divided in different types, relating to their forms:
1. The shield volcano:
This is a broad, shallow volcanic cone, which arises because the running lava, which is fluid and hot, cools slowly.
2. The dome volcano:
This one has a steep, convex slope from thick, fast-cooling lava
3. The ash-cinder volcano:
Throws out - besides lava - much ash into the air. Through this the volcanic cone is built up from alternate layers of ash and cinder.
4.The composite volcano:
These are also built up from alternate layers of lava and ash but, besides its main crater, it has many little craters on its slope.
5. The caldera volcano:
An older volcano with a large crater which can be 62 miles(100km) wide. In this crater many little new craters are formed.
Extinct volcanoes
Extinct volcanoes are those that scientists consider unlikely to erupt again, because the volcano no longer has a lava supply. Examples of extinct volcanoes are many volcanoes on the Hawaiian Islands in the U.S. (extinct because the Hawaii hotspot is centered near the Big Island). Otherwise, whether a volcano is truly extinct is often difficult to determine.
Dormant volcanoes
It is difficult to distinguish an extinct volcano from a dormant one. Volcanoes are often considered to be extinct if there are no written records of its activity. Nevertheless volcanoes may remain dormant for a long period of time, and it is not uncommon for a so-called "extinct" volcano to erupt again.
Effects of volcanoes
There are many different types of volcanic eruptions and associated activity: phreatic eruptions (steam-generated eruptions), explosive eruption of high-silica lava (e.g., rhyolite), effusive eruption of low-silica lava (e.g., basalt), pyroclastic flows, lahars (debris flow) and carbon dioxide emission. All of these activities can pose a hazard to humans. Earthquakes, hot springs, fumaroles, mud pots and geysers often accompany volcanic activity.
Gas emissions from volcanoes are a natural contributor to acid rain. Volcanic activity releases about 130 to 230 teragrams (145 million to 255 million short tons) of carbon dioxide each year.Volcanic eruptions may inject aerosols into the Earth's atmosphere. Large injections may cause visual effects such as unusually colorful sunsets and affect global climate mainly by cooling it. Volcanic eruptions also provide the benefit of adding nutrients to soil through the weathering process of volcanic rocks. These fertile soils assist the growth of plants and various crops. Volcanic eruptions can also create new islands, as the magma cools and solidifies upon contact with the water.
Famous volcanoes
Name :Crater lake
Location:Oregon
Facts:Last erupted 6,600 years ago with 43,000x the force of an atomic bomb.
Name:Mt. Rainier
Location:Washington
Facts:prehistoric lava flowed for 70 miles.
Name:Mt. Etna
Location:Sicily
Facts:Constantly active; still creates craters regularly
Bibliography
http://en.wikipedia.org/wiki/Volcanos
http://www.geography.learnontheinternet.co.uk/images/nathaz/volcanoxsec.gif
http://www.fema.gov/kids/volcano.htm
http://www.learner.org/interactives/volcanoes/
http://www.universetoday.com/guide-to-space/earth/famous-volcanoes/