Atmosphere
Define atmosphere.
The atmosphere is a layer of gas above the Earth’s surface.
What are bio plastics ?
Bioplastic is a biodegradable material that comes from renewable sources (biomass, such as vegetable oils, sawdust or food waste) unlike conventional plastics that are made from petroleum.
Name 3 renewable energy sources.
Solar, Wind, Tidal.
What is the process of making food using carbon dioxide and water to produce glucose and oxygen called?
Photosynthesis
Scientists think that the Earth was formed about ______ million years ago.
4600 million years ago
What is the full form of bio plastics ?
Bio-PET or biopolyethylene
What is produced when fossil fuels are burnt to generate electricity,
and what problem does it add up ?
Carbon Dioxide and Global Warming
How did the scientists know that oxygen levels in the atmosphere continued to rise?
Scientists know this because there was enough oxygen to combine with iron in the rocks to form iron oxide.
How did the early atmosphere form ?
The volcanoes produced gases, which formed the early atmosphere.
Who invented bio plastics ?
Maurice Lemoigne
What did people grind using windmills ?
Wheat into flour
200 million years ago, why carbon dioxide was very less in the atmosphere?
Most of the carbon had been used to make the chemicals, which are part of all living things. Some organisms do not rot when they die and are turned into fossil fuels such as oil or coal. The carbon is locked up in the fossil fuels until they are burned them.
Fill in the blanks
Water vapour was produced by the ________ and, as the Earth cooled, this water vapour condensed into _______. The water fell as rain and formed the first lakes and oceans.
1.Volcanoes
2.liquid water
Bioplastics can include _________to increase their performance.
How do we generate electricity using tides ?
We need to trap the water, in river estuaries, behind a barrier and then generate electricity by releasing the water to flow through electricity generator turbines as the tide goes out.
carbon + oxygen=?
Carbon dioxide
The early atmosphere of earth was compared to which planet in our solar system?
Venus
What will the use of bio plastics from renewable resoures help to reduce ?
The use of fossil fuels and to prevent damage to the environment caused by disposal of single-use plastics.
What cells can convert solar energy to electrical energy ?
Photovoltaic cells
3500 years ago, What did the micro-organisms produce as a waste product when they used carbon dioxide in the atmosphere to make food.
Oxygen