디지털 교재

• 모든 유형
• 3D 애니메이션
• 도구 및 게임
• 퀴즈
• 도해 사전
• 3D 백과전서
• 디지털 교재
• 연습장
• 비디오
• 이미지
• 사운드

Chlorine is a highly reactive, toxic gas, which can be used for cleaning and disinfecting.

More interesting facts about capillary action.

이 교재는 죽은 동물을 먹는 조류인 큰 독수리가 서식지의 깨끗함을 유지하는 데에 어떤 역할을 하는지를 설명한다.

Learn about the life of the famous monk who played a key role in the Bulgarian National Revival.

Learn about the medieval khan who founded the First Bulgarian Empire.

Oxygen is the most abundant element in the Earth's crust; it is essential to life.

The ozone layer protects the Earth's surface from harmful ultraviolet radiation; however, the presence of ozone near the surface is dangerous.

Learn about the history of banks and their main services.

Learn about the main events and results of the French Revolution.

An unstable chemical compound consisting of hydrogen and oxygen.

How can others see me? Why cannot they spot me? These are very important questions when being on the road.

Learn about the Byzantine missionary brothers who created the first Slavic alphabet.

Learn about the Egyptian queen Cleopatra, one of the best-known women in Ancient history.

A yellow crystalline solid that has several allotropes.

Learn about one of the most significant Bulgarian writers of the 20th century.

Learn how physicist found out that atoms are divisible.

Follow the journey of wheat from the field to the dining table.

Nitrogen comprises 78% of the air and is indispensable for living organisms.

In this lesson, you will learn about the characteristics of hydrogen sulphide.

Toxic compounds that cause acid rain and are utilised as industrial raw materials.

The most widely produced oxyacid that has a corrosive or passivating effect, depending on its concentration.

A lesson about various compounds of nitrogen and oxigen.

Some processes cool the environment, while others heat it.

Learn what differentiates donkeys from horses.