Notes, abstracts, papers, exams and problems of Secondary education

Industry

Industry: The economic sector focused on large-scale production of physical goods for industrial processes or consumption.

Historical Development of Industry

Artisanal Labor (Up to the late 18th century)

Skilled craftspeople transformed raw materials into manufactured goods, limited by human capacity. Craftsmen's districts and guilds emerged in major cities.

First Industrial Revolution (Late 18th - Late 19th century)

Coal-fueled, steam-driven machines enabled large-scale manufacturing, particularly in textiles and metal goods, primarily in Great Britain.

Second Industrial Revolution (Late 19th - Late 20th century)

Mass production and assembly lines revolutionized manufacturing. New energy sources like oil and electricity boosted productivity.... Continue reading "Industrial Activities and Transformations" »

The Russian Revolution of 1917

Causes of the Revolution

At the beginning of the 20th century, Russia's empire extended from the Baltic to the Black Sea and from Poland to the Pacific Ocean. It was ruled by the Tsars of the Romanov dynasty and was in a state of turmoil. Dissatisfaction at the political level was due to the autocratic government of the tsars and led to political opposition made up of liberal bourgeois parties and Marxist revolutionary parties, such as the Bolsheviks.

Economic and Social Discontent

Dissatisfaction at the economic and social levels was due to the contrast between the rich minority, who owned land and factories, and the extremely poor peasants and industrial proletariat.

The Revolutions of 1905 and 1917

• In 1905, general

The Consequences of the Revolution

1.3 The consequences of the revolution. The USSR. Lenin's government (1921-1924). Lenin held all the political power. In 1922, he created a political organization called the Union of Soviet Socialist Republics (USSR), made up of Russia and other Asian republics. It was organized as a federal state and adopted a New Economic Policy (NEP), which combined communist and capitalist policies. Thanks to this policy, the Soviet economy made a recovery.

• Stalin's government (1927-1953). Lenin's successor began a new era, called 'Stalinism'. A totalitarian political system was established which used state violence to purge society of his opponents. The economy became controlled by the state. Land was collectively owned... Continue reading "The Consequences of the Revolution and the Roaring Twenties" »

- Serf: A person who serves a lord and works in exchange for protection.

- Lord: A noble who provides protection and rules the land.

- Vassal: Lesser nobles/peasants who provide a service for protection.

- Arabs: The dominant social group who owned large states (latifundia).

- Berbers: They had converted to Islam and worked as livestock farmers, agricultural workers, or soldiers. They felt discriminated against.

- Muladíes: Natives of the peninsula who had converted to Islam. Most of them worked in agriculture.

- Mozarabs: Natives of the peninsula who had not converted to Islam and maintained their Christian beliefs.

- Bellatores: Those who wage war and defend the rest of society in times of war.

- Oratores: Those who pray and guarantee the salvation... Continue reading "Feudalism and Social Groups in Medieval Times" »

I had a terrible day yesterday! First, I woke up and got ready, then I had breakfast. After eating, I left for school and waited for the bus, but after 10 minutes it still wasn't there. I took my phone to check the time and realized that my watch wasn't on time. I had to walk to school and arrived late. It put me in a bad mood! In Math class, we had a very difficult test. When I got home, my mom got angry at me for being late to school. To sum up, it was a terrible day! And you, how was your day? What did you do?

Continental Environments

Fluvial (River) Environments

• Stream/river channels
• Sand bars
• Levees
• Floodplains

Lacustrine (Lake) Environments

• Vary in depth, salinity, biological activity, and sediment
• Source sand and mud

Aeolian (Desert) Environments

• Little to no annual precipitation
• Low vegetation
• High wind
• Transport of sand grains
• Dunes contain well-sorted, well-rounded, and frosted (scratched during wind transport) sand grains sand and dust

Paludal (Swamp) Environments

• Area of anoxic (deoxygenated) water where plant material accumulates but cannot decompose (coal)
• Very low energy environment

Glacial Environments

• Glacial meltwater and sediment transport
• Sand, mud, gravel

Transitional Environments

Deltas

• Fan-shaped deposits of sediment
• Coarser sediment is commonly deposited

Latitude: Temperature increases as you go south. Precipitation is higher in the north. Relief: Altitude causes temperature to fall and precipitation to rise. Mountain ranges are barriers that block air masses. The influence of the sea makes coastal temperature milder and increases the contrast in temperature in the interior.

Oceanic Climate: Galicia to País Vasco

Temperature is mild with no great contrasts, cool winters, and mild summers. There is abundant and regular precipitation with very few dry months. Vegetation is characterized by deciduous forests of oaks and beeches, meadows, and grasslands.

Mediterranean Climate: Mediterranean coast and interior

Precipitation is moderate (800-300) and irregular with droughts in summer. Temperature doesn'... Continue reading "Climate and Vegetation Types in Spain" »

Two years ago, I met again with a girl named Maite. Maite and I had been friends since we were little. We met in Barcelona, specifically in the Ramblas of Plaza Cataluña. She used to live here, in La Llagosta, but due to family problems, she had to move to France.

When we met, it was very strange because we didn't know how to react by simply saying hello or hugging each other. When we saw each other, we quickly went towards each other and hugged each other very tightly. It had been two years since we had seen or spoken to each other. We had completely lost touch. We started talking, and I told her that there were times when I talked to her, but she didn't get the messages and she told me that she had changed her cell phone and lost all of her... Continue reading "Reconnecting with Old Friends: Stories of Friendship and Change" »

The Central Dogma of Molecular Biology

Replication - General Characteristics:

• DNA replication is semiconservative: each strand in the DNA double helix acts as a template for the synthesis of a new, complementary strand. The new two daughter molecules of DNA have a new strand and an old one.
• DNA polymerase III: is the enzyme that adds nucleotides to the growing DNA chain, incorporating only those that are complementary to the template. DNA polymerase III has the following characteristics:
  • It can only read a template in 3’-----5’ direction so the new strand grows in 5’----3’ direction.
  • It needs a pre-existing strand of nucleotides called a primer which provides a 3’-OH end to bind new nucleotides.
  • It is able to repair the mistakes by removing

Properties of Metals

PROPERTIES OF METALS: good electrical, thermal and acoustic conductors; ductile and malleable; tough; they melt at high temperatures, expand when the temperature rises and contract when it cools; some are magnetic; rust when they come into contact with air and oxygen (not all); can be recycled and reused, some are toxic for the environment.

Ferrous Metals

FERROUS METALS: main component is iron.

PURE IRON: greyish white colour, good magnetic properties. Disadvantages: only melts at high temperature, difficult to machine, fragile and brittle. Uses: rarely used, used in electronics and electrical components. CAST IRON: very hard and resistant. Uses: machine parts, casing for engines, stands for machines, pistons, street lamps,... Continue reading "Properties of Metals and Ferrous vs. Non-Ferrous Metals" »