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

Report: Online Activities of Teens

To: The European School Council
From: Chavin Kaze
Subject: Online Activities of Teens
Date: 11 November 2025

Introduction

The purpose of this report is to analyze how students use their smartphones in everyday life. Consequently, a survey was conducted among students aged 13 to 17 at our school. The results are summarized below.

Results of the Survey

The survey indicates that texting friends is the most popular activity among teens, with 88% of students doing it regularly. Other common activities include:

• Watching videos: 75%
• Playing games: 70%
• Viewing photos: 68%
• Making phone calls: 62%
• Doing research: 40%

The least popular activity is doing research, likely due to its association with academic tasks.

Reasons

Academic Vocabulary List

Adulterate

— make impure

Augment

— increase

Dour

— gloomy

Fortitude

— courage

Gape

— stare open-mouthed

Guise

— appearance

Insidious

— harmful but subtle

Opulent

— very wealthy

Reiterate

— repeat

Tentative

— unsure

Unkempt

— messy

Verbatim

— word-for-word

Amicable

— friendly

Averse

— strongly opposed

Belligerent

— aggressive

Benevolent

— kind

Duplicity

— deceit

Extol

— praise highly

Feasible

— possible

Impervious

— not affected

Impetus

— driving force

Jeopardy

— danger

Nostalgia

— longing for the past

Scrutinize

— examine closely

Adversary

— enemy

Alienate

— isolate

Coerce

— force

Craven

— cowardly

Culinary

— related to cooking

Demise

— death

Harass

— bother repeatedly

Muse

— think deeply

Perpetuate

— make continue

Precedent

—

Measuring Global Development and Inequality

Inequalities can be measured in many ways because development is not only about money. The traditional way to measure development is wealth, usually through the Gross Domestic Product (GDP) and GDP per capita. These indicators show how much a country produces and how rich it is on average, but they do not show how wealth is distributed or what the quality of life is like.

For this reason, welfare is also considered. Welfare refers to overall well-being and includes:

• Housing and safety
• Social services
• Access to culture
• General living conditions

Contemporary Development Indicators

To understand development more accurately, contemporary indicators are used. One of the most important is the Human Development

1. Homeostasis and Ecology

• 1(a) Maintaining constant internal conditions.
• 1(b) 250 hours.
• 1(c)(i) A.
• 1(c)(ii) Fertilisers from farms run off into rivers. This causes algal growth. Less light penetrates, reducing photosynthesis. Pesticides kill organisms.
• 1(d)(i) Low FSH: eggs do not mature.
• 1(d)(ii) Low LH: no ovulation.
• 1(e)(i) Less water is absorbed into the blood. Water moves by osmosis because water potential remains higher in the blood.
• 1(e)(ii) Mutation. Only resistant bacteria survive. They reproduce and pass on the allele.
• 1(f)(i) Denitrifying bacteria convert nitrate to nitrogen gas. This reduces algal growth, so there is more oxygen in rivers.
• 1(f)(ii) Roots absorb water. More transpiration occurs, leading to slower water flow and less runoff.

Understanding Leadership Fundamentals

Leadership is the process of influencing, guiding, and motivating people to achieve specific goals.

Motivation to Lead

According to House & Singh (1987), leadership motivation involves:

• High power motive
• Low inhibition
• Low affiliation need

Chan & Drasgow (2001) identify three primary factors:

• Affective-identity: Power-based motivation.
• Instrumental: Benefit-based motivation.
• Social-normative: Duty-based motivation.

Leader vs. Manager

• Leaders: Focus on vision, change, people, long-term goals, and risk-taking.
• Managers: Focus on execution, stability, tasks, short-term goals, and are risk-averse.

➡ The best professionals effectively balance both roles.

Leadership Theories

Trait Theory

This theory failed because specific... Continue reading "Mastering Leadership Styles and Organizational Commitment" »

1.1. Demography

Demography is the science that studies population—its number, structure, and dynamics. It helps governments plan policies and decide how to invest resources in the future.

1.2. Sources for the Study of Demography

• Population censuses: Surveys carried out every ten years on families and different demographic and social variables.
• Municipal registers: Show population data of each municipality (in Spain, they are updated every year).
• Civil registry: Records births, marriages, and deaths.

1.3. Distribution of the World Population

According to the United Nations, the world population exceeds 8.2 billion people and increases by about 80 million each year.

Factors Influencing Population Distribution

• Physical factors:
  • Climate: Higher population

Understanding Feeding and Nutrition

Feeding vs. Nutrition: Key Differences

• Feeding (Eating): Subjective, voluntary, and conscious actions related to consuming food.
• Nutrition (Nourishing): Involuntary, unconscious, and objective processes involving the assimilation of nutrients by the body.

Essential Nutrients: Organic and Inorganic

Nutrients are classified based on whether they contain carbon (C).

Inorganic Nutrients

These nutrients do not contain carbon (C). They are vital for bodily functions.

• Water: Essential for all chemical reactions in the body.
• Mineral Salts: Essential inorganic nutrients needed in small amounts.

Organic Nutrients

These nutrients contain carbon (C). They provide energy and building blocks for the body.

• Carbohydrates: Provide fast

Proximity to Markets, Labour, and Competitors

Proximity to Market

Businesses that produce bulky, heavy, or fragile goods often choose to locate close to their customers so that transportation costs remain low. Service-based businesses may also prefer being near their customers since many services—such as hairdressing or restaurants—are delivered face-to-face.

Proximity to Labour

Firms often look for locations where labour is affordable or where specific skills are available. Labour skills are not evenly spread across regions. For example, some companies in Europe and the USA have moved production to Southeast Asia because wages are lower and labour is readily available.

Proximity to Competitors

Some businesses choose to avoid locating near competitors... Continue reading "Key Factors Influencing Business Location Decisions" »

Human Impact on Climate

Human activities significantly alter the Earth's climate through several key processes:

• Burning fossil fuels: Increases greenhouse gas concentrations.
• Deforestation: Reduces natural CO₂ absorption.
• Agriculture: Releases methane and nitrous oxide.
• Urbanisation: Creates heat islands.

Overall effect: Global warming, rising sea levels, extreme weather, and ecosystem changes.

Human Impacts on the Amazon Rainforest

• Deforestation for cattle, crops, logging, and mining.
• Loss of habitat and biodiversity.
• Increased frequency of fires and droughts due to climate change.
• Soil degradation and river pollution.
• Reduced carbon absorption capacity.

How Humans Alter Biomes

• Clearing land for farming, housing, and infrastructure.
• Introducing invasive