HSE Prep – Science

HSE Prep

Hi there. This is the page where we keep all of our Science lessons. We’ve broken all of our lessons into sections – scroll down to find the topic you want to work on.

Earth and Space Science

Our Place in the Universe

What a strange Universe we live in. But what is the Universe? What’s a planet? Since when did Pluto stop being a planet? Let’s find out with this lesson on our place in the Universe.

Expanding Universe

Let’s talk about the universe in this tutorial. One of the interesting things about the universe is that it is currently expanding. It’s growing larger and larger all the time. Not only is it growing larger, but the edge of the universe is expanding at a faster and faster rate. Scientists think that the edge of the universe is expanding faster than the speed of light.

Big Bang Theory

The big bang is how astronomers explain the way the universe began. It is the idea that the universe began as just a single point, then expanded and stretched to grow as large as it is right now (and it could still be stretching).

Stars and Galaxies

In our previous tutorial, we  learned about the universe and the big bang theory of how it all began. Have you ever wondered about the objects we see in the Universe, stars, galaxies, asteroids, constellations. There are many objects that we know are there in the Universe. In this Tutorial, we are learning about the Stars and Galaxies.

Asteroids and Black Holes

As we know now that there are many objects that we know are there in the Universe. The Universe is vast of which our galaxy is only a small part. We have the sun, planets, stars; every planet has a different number of moons, asteroids and meteors. In this Tutorial, we are learning about asteroids and blackholes.

Sun and Moon

In our previous tutorial, we learned about the objects that we see in universe. Do you think Earth is the most important spot in the solar system? Think again. The sun is the real star of the show—literally! And the Moon is a large natural object that orbits, or travels around, Earth. After the Sun it is the brightest object in the sky. Let’s explore more about sun and the moon in this tutorial.


Sun-Moon-Earth System

The motions of bodies in the solar system are, for the most part, regular and understandable. From Earth, the Sun rises in the eastern sky in the morning and sets in the western sky in the evening. If the Moon is full on Day 1, it will be full again on Day 28, and new on Day 14. The motions of Earth relative to the Sun, and the motions of the Moon and Sun relative to Earth affect different phenomena on Earth, including day and night, the seasons, tides, and phases of the Moon.

Structure of Earth

Earth is a lot stranger than you might think. Underneath your feet is thousands and thousands of kilometers of liquid rock and spinning metal. Let’s take a look at what exactly is going on in this lesson. 

Earth's Rotation and Resolution

The spinning of the earth is called rotation. … At the same time, the earth is moving around the sun. This is called a revolution. It takes a little over 365 days, or one year, for the earth to make one full revolution around the sun…!!


Weather is the state of the atmosphere, describing for example the degree to which it is hot or cold, wet or dry, calm or stormy, clear or cloudy. Weather refers to day-to-day temperature and precipitation activity. 


Climate means the usual condition of the temperature, humidity, atmospheric pressure, wind, rainfall, and other meteorological elements in an area of the Earth’s surface for a long time. In simple terms climate is the average condition for about thirty years.


In this tutorial, we are talking about the Seasons. A season is a period of the year that is distinguished by special climate conditions. The four seasonsspring, summer, fall, and winter—follow one another regularly. Each has its own light, temperature, and weather patterns that repeat yearly.

Natural Hazard Part 1

Let’s talk about the Natural Hazards in this tutorial. Natural hazards are extreme natural events that can cause loss of life, extreme damage to property and disrupt human activities. … Other natural hazards, such as tornadoes, can only happen in specific areas. And some hazards need climatic or tectonic conditions to occur, for example tropical storms or volcanic eruptions.

Natural Hazard Part 2

In this tutorial, we are looking at different types of Natural disasters, for example – Earthquakes, Tsunamis and Volcanic eruptions.

Cycles In Earth

Water Cycle

In this tutorial, we are learning about the water cycle, water cycle shows the continuous movement of water within the Earth and atmosphere. … Liquid water evaporates into water vapor, condenses to form clouds, and precipitates back to earth in the form of rain and snow. 

Carbon Cycle

Here, we are talking about the carbon cycle is nature’s way of reusing carbon atoms, which travel from the atmosphere into organisms in the Earth and then back into the atmosphere over and over again.

Nitrogen Cycle

The nitrogen cycle is the biogeochemical cycle by which nitrogen is converted into multiple chemical forms as it circulates among atmosphere, terrestrial, and marine ecosystems. The conversion of nitrogen can be carried out through both biological and physical processes.

Earth's Resources

Earth and Human Activity

In this tutorial, we are talking about how human activities have caused serious environmental problems, polluting natural resources and disrupting ecosystems. Deforestation, urbanization, and agricultural practices are some of the ways in which humans have greatly changed the Earth, affecting both the abiotic and biotic environment.

Natural Resources Part 1

Ever since the earth was inhabited, humans and other life forms have depended on things that exist freely in nature to survive. They are called Natural Resources and are the basis of life on earth. Let’s explore more about Natural Resources.

Natural Resources Part 2

In this tutorial, we are discussing the major concerns and solutions in terms of conserving our Natural resources. Even though natural resources are the basic support structures of life, too much or too little of it can come with a lot of trouble and conflict. In many regions of the world a mix of limited resources, overpopulation and environmental degradation has produced extreme poverty and income inequality.

Life Sciences

What are Cells

A cell is a smallmembrane-bound compartment that contains all the chemicals and molecules that help support an organism’s life. An understanding of the structure of cells is one of the first steps in comprehending the complex cellular interactions that direct and produce life. Cells can be thought of as building blocks of organisms.