Describe how to make the following models with the help of objects found around you.
1. Sandclock model
Answers
Answer: sand is the single most mined commodity, eclipsing minerals and metals by a colossal margin. Around 85% of the material we pull up from the earth is sand, gravel or other aggregate materials. Sand is also the most consumed substance after water, being used in virtually every construction or manufacturing process, even used as an ingredient in toothpaste.
Globally our annual aggregate consumption is somewhere around 53 billion tonnes – the equivalent to every person on earth using 20kg of sand every single day. And with rapid global urbanisation, particularly owing to economic growth across East Asia, the demand for sand is only increasing: since the early 2000s, China has used more sand every three years than the United States used in the entire 20th century.
Explanation: hope this will help u