Formation of Earth's Atmosphere
1. This question has 5 part(s).
1.1. This question is about the evolution of the atmosphere.
Figure 1 shows the changes that have occurred over the last 4.6 billion years.
Figure 1
Since the early atmosphere, water vapour levels have decreased.
Give two other differences between the composition of the early atmosphere and the atmosphere today.
1.2. What is the main gas in the atmosphere today?
Tick (✓) one box.
oxygen | |
carbon dioxide | |
nitrogen | |
argon |
1.3. Complete the sentences using the words in the box to describe what happened to the water vapour in the early atmosphere.
increased | ocean | decreased |
volcanoes | evaporated | condensed |
The temperature of the earth's surface ____________________.
The water vapour in the air ________________________ to form the _____________________________.
1.4. It is thought that algae evolved around 2.6 billion years ago.
They use carbon dioxide and water to produce oxygen.
Name the process they use to do this.
Circle one answer.
Combustion | Respiration | Photosynthesis |
1.5. Complete the word equation for this process.
__________________ + water → _________________ + oxygen
Ai এর মাধ্যমে
১০ লক্ষ+ প্রশ্ন ডাটাবেজ
প্র্যাকটিস এর মাধ্যমে নিজেকে তৈরি করে ফেলো
উত্তর দিবে তোমার বই থেকে ও তোমার মত করে।
সারা দেশের শিক্ষার্থীদের মধ্যে নিজের অবস্থান যাচাই
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