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Earth as a System : Energy, Matter, and Life

CBSE · Class 9 · Science

Flashcards for Earth as a System : Energy, Matter, and Life — CBSE Class 9 Science. Quick Q&A cards covering key concepts, definitions, and formulas.

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Card 1Earth spheres

पृथ्वी के पाँच मंडल कौन-से हैं?

Answer

पृथ्वी के पाँच परस्पर क्रिया करने वाले मंडल हैं: स्थलमंडल, जलमंडल, हिममंडल, वायुमंडल, और जीवमंडल। स्थलमंडल में चट्टानें, मिट्टी, स्थलरूप, और पृथ्वी का आंतरिक भाग शामिल है। जलमंडल में महासागरों, नदियों

Card 2Earth spheres

What are the five spheres of Earth?

Answer

Earth has five interacting spheres: geosphere, hydrosphere, cryosphere, atmosphere, and biosphere. The geosphere includes rocks, soil, landforms, and Earth's interior. The hydrosphere includes liquid

Card 3Earth system

Why is Earth called a system?

Answer

Earth is called a system because its spheres interact continuously. A change in one sphere can affect the others. For example, less snowfall can reduce lake water, grass growth, and the support availa

Card 4Earth system

पृथ्वी को एक प्रणाली क्यों कहा जाता है?

Answer

पृथ्वी को एक प्रणाली कहा जाता है क्योंकि इसके मंडल लगातार परस्पर क्रिया करते हैं। एक मंडल में बदलाव दूसरे मंडलों को प्रभावित कर सकता है। उदाहरण के लिए, कम हिमपात झील के जल, घास की वृद्धि, और जानवरों क

Card 5Solar radiation

सौर विकिरण पृथ्वी तक कैसे पहुँचता है?

Answer

सौर विकिरण विद्युतचुंबकीय तरंगों के रूप में पृथ्वी तक पहुँचता है। ये तरंगें बिना किसी माध्यम के निर्वात से यात्रा कर सकती हैं। सूर्य का प्रकाश मुख्य रूप से पराबैंगनी, दृश्यमान, और अवरक्त श्रेणियों में

Card 6Solar radiation

How does solar radiation reach Earth?

Answer

Solar radiation reaches Earth as electromagnetic waves. These waves can travel through vacuum without a medium. Sunlight is mainly found in the ultraviolet, visible, and infrared ranges. About 99% of

Card 7Waves

Why do sound waves behave differently from sunlight?

Answer

Sound waves are mechanical waves and need a medium to travel. Sunlight is an electromagnetic wave and can travel through vacuum. This is why light from the Sun can reach Earth through space, but sound

Card 8Waves

ध्वनि तरंगें सूर्य के प्रकाश से अलग तरह से क्यों व्यवहार करती हैं?

Answer

ध्वनि तरंगें यांत्रिक तरंगें होती हैं और यात्रा करने के लिए माध्यम की आवश्यकता होती है। सूर्य का प्रकाश एक विद्युतचुंबकीय तरंग है और निर्वात से यात्रा कर सकता है। इसी कारण सूर्य से आने वाला प्रकाश अंत

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Frequently Asked Questions

What are the important topics in Earth as a System : Energy, Matter, and Life for CBSE Class 9 Science?
Earth as a System : Energy, Matter, and Life covers several key topics that are frequently asked in CBSE Class 9 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Earth as a System : Energy, Matter, and Life — CBSE Class 9 Science?
Understand the core concepts first, then work through the 71 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.
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