निम्नलिखित में से कौन सा एक निम्न श्रेणी का भूरा कोयला है जो उच्च नमी सामग्री के साथ नरम होता है?

Mineral wealth, forests, landforms, and water bodies are classified as:

Which type of resource is directly or indirectly derived from the photosynthetic activity of green plants?

How are natural resources categorized based on their origin?