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+3 votes
2 lessons
In 4-6 by Asher Streets Rockstar (4.5k)  

Atom is a basic buidling block of matter. This doesn't mean that there are no smaller particles than atom, but only atom is stable enough to exist on its own indepently or in a combination with other atoms in a molecul.

This very nice video gives more detailed info on the topic of atoms.

What is a molecul? A molecul would be a combination of different atoms in differen numbers and variations, bonded together. A good example for this is water with a chemical formula H2O, meaning the molecul of water is made of two atoms of hydrogen (H) and one atom of oxygen (O).



+3 votes
1 lesson
In 4-6 by Petar Mares Guru (5.9k)  

Materials, things are done from different materials, here is a video about materials:

Thanks to Crash Course



+3 votes
2 lessons
In 7-9 by Tanya van den Berg Guru (6.6k)  

REASONS for climate change                                     

Human activity such as: 

  • Increased use of fossil fuels (oil, coal and gas)
  • Increasingly intensive agriculture which emits greenhouse gases
    • Carbon dioxide is the main cause of human-inducted climate change
  • Deforestation 

Natural causes: 

  • Volcanic activity 
  • Solar output
  • Earth's orbit around the sun

CONSECUENCES of climate change

  • Fresh water shortages
  • Ice is melting which contributes to sea-level rise
    • Number of floods will increase
  • Storms and heatwaves
  • Temperature changes are also affecting wildlife and other species as well

It's hard to say how greatly will the climate change in the future which makes it hard to evaluate the true consequences. 

Climate change in a nutshell

Thanks to National Geographic 

Read the text and watch the video then think about this question: 

What can YOU do about climate change?



+3 votes
1 lesson
In 7-9 by Magnus Willner Rockstar (4.9k)  
If you wanna learn this but don't have the fantastic Arduino yet, check out how to work with the Arduino in a simulator (Thinkercad):
look here if you have an Arduino.


+3 votes
2 lessons
In 7-9 by Makaela Anderson Guru (7.6k)  

The best way to speak English fluently is to think in English!  Stop translating and start thinking in English with some of these good tips from Accent's Way



+3 votes
2 lessons
In 7-9 by Juhani Katajamäki Guru (6.1k)  

How to calculate to get the probability of getting 11 with two dice

Thanks to Don't Memorise



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