Notes, summaries, assignments, exams, and problems for Secondary education

Idiophones

Idiophone instruments are those in which the sound is produced by the vibration of the instrument itself. They are classified considering the way the sound is produced, that is, how they are played. They can make sounds when hit, concussed, shaken, plucked, scraped, or even rubbed.

Percussion Idiophones

They can be pitched like bar instruments and those we can find in sets like the temple block. They can also be unpitched like the triangle, the gong, the woodblock, or the cajón flamenco.

Concussion Idiophones

Castanets, claves, and cymbals.

Shaken Idiophones

Maracas and rattles.

Plucked Idiophones

The berimbau and the sansa.

Scraped Idiophones

The güiro, the washboard, or the ratchet.

Friction Idiophones

Musical glasses, the glass harmonica,... Continue reading "Musical Instrument Classification: Types and Examples" »

String Instruments

These instruments produce sound through the vibration of one or more strings.

Depending on the vibration technique, we distinguish bowed, plucked, and struck strings.

Bowed String

Sound is produced by rubbing the strings with a bow. They typically have four strings and a similar shape.

• Violin: Smallest, highest pitch.
• Viola: Slightly larger than the violin, middle pitch.
• Violoncello: Larger, lower register, played sitting with an endpin.
• Double Bass: Largest, very low register, played standing.

Plucked String

Sound is produced by plucking the strings with fingers, a pick, or a plectrum.

• Harp: Has 47 strings.
• Guitar: Has six strings and a fretted neck.

Struck String

Sound is produced by striking the strings with hammers activated by a keyboard.... Continue reading "Musical Instrument Families: Strings, Winds, and Percussion" »

Unit 8. Endocrine System

The endocrine system is made up of the endocrine glands and the hormones they produce. Those glands produce hormones, chemical messengers that affect many cell processes (accelerating, delaying, starting, or stopping them). Hormones are transported by blood to all the cells in the body, but they only affect very specific target cells, which have specific receptors for that hormone. The hormone causes changes inside those cells.

Glands release only small quantities of hormones, and once the hormone has carried out its function, it is eliminated from the body.

The hypothalamus, a gland located in the brain, connects the nervous system and the endocrine system. It is one of the most important glands because it controls many... Continue reading "Human Endocrine System: Glands, Hormones and Disorders" »

1. Loss and New Beginnings

The father dies of pneumonia. His favorite daughter had just died a few weeks earlier, and this caused him to fall into a deep depression. He was so depressed that he didn’t mind living or dying.

After the father's death, the family didn’t go back to Norway. The mother was pregnant and had to take care of six small children. Nevertheless, she wanted her children to go to an English school, as her husband had wanted.

2. The Sweet Obsession and the Dead Mouse

The kids were obsessed with the sweets from a particular shop. They had a hole under the floor in their classroom where they hid some sweets and ate them at the end of class. One day, they find a dead mouse inside the hole and decide to place it inside a candy... Continue reading "A Norwegian Family's Journey: Life at St. Peter's School" »

Narrative Tenses

• Past Simple

  I did (yo hice)

  Used with specific past time markers: last summer, three years ago, in 1998, when I was twelve.

• Present Perfect Simple

  I have done (he hecho)

  Used with: for five years, since March, since 1998, how long?, yet, just, already, ever, never.

• Present Perfect Continuous

  I have been doing (he estado haciendo / llevo haciendo)

• Past Perfect Simple

  I had done (había hecho)

• Past Perfect Continuous

  I had been doing (había estado haciendo)

Gerunds

The Gerund (Verb + -ing) is used:

1. After Prepositions

   Examples: think of, interested in, tired of, talk about.

2. As a Subject

   Example: Working is necessary.

3. After Certain Verbs and Expressions

   Verbs: appreciate, like, imagine, postpone, resent, delay, enjoy, keep, practise, risk, discuss,

Ejercicios de Subredes Clase C

1. Subnetting con Máscara 240 (/28)

La máscara de subred 255.255.255.240 corresponde a /28 (4 bits de subred, 4 bits de host).

Representación binaria del último octeto: 11110000.

Tabla de Subredes /28 (Red 192.168.27.0)

Tourism

The tourism industry

Tourism is the temporary movement of people from their place of residence to another place in order to enjoy their free time. Tourism is therefore related to leisure. The development of the tourism industry involves creating the necessary transport and hospitality infrastructure to meet demand: airports, roads, accommodation, restaurants, etc. The main characteristic of the tourism industry is seasonal variation or seasonality.

Repercussions of tourism

It represents a significant source of revenue for a country. It creates jobs, but many of them are temporary, due to seasonality. It improves cultural relations between citizens of different countries. Destroys natural landscapes. In developing countries, the destination... Continue reading "The Impact of Tourism on the Environment and Economy" »

What is Virtue?

Virtue is an acquired habit and firm disposition to do good.

Theological Virtues:

• Faith: Belief in God and all that He has revealed to us. It is a theological virtue by which we believe in God and all He has revealed to us.
• Hope: Firm confidence in eternal life.
• Charity: Love God above all things and all neighbors as ourselves.

Moral Virtues:

• Prudence: Practical reason to discern in all moments.
• Temperance: Moderates the attraction to sensual pleasures.
• Justice: Consists in the constant and firm will to give to God and neighbor what is due to them.
• Fortitude: Firmness and constancy in the practice of good.

The Seven Deadly Sins

The deadly sins, or capital vices, are those to which fallen human nature is mainly inclined. The deadly sins... Continue reading "A Guide to Catholic Virtues, Sins, and Commandments" »

Growing Up in Ancient Greece