The correct option is Cumulus and Cumulonimbus.
Explanation
Clouds are classified based on their altitude, stretch, density, and transparency. The World Meteorological Organization (WMO) groups clouds into four main categories: High clouds, Middle clouds, Low clouds, and Clouds with extensive vertical development.Analysis:
- Altostratus and Altocumulus is Incorrect: Altostratus and Altocumulus are classified as Middle clouds (forming between 2 km and 6 km). They typically appear as sheets or layers and do not exhibit the towering vertical growth characteristic of convective clouds.
- Cumulus and Cumulonimbus is Correct: Cumulus and Cumulonimbus are classified as Clouds with extensive vertical development.
- Cumulus clouds appear as cotton wool with a flat base and develop vertically.
- Cumulonimbus clouds are dense, towering clouds that extend from low levels to very high altitudes. They are associated with thunderstorms, heavy rain, and hail.
- Cirrostratus and Cirrocumulus is Incorrect: Cirrostratus and Cirrocumulus are classified as High clouds (forming between 8 km and 12 km). They are composed of ice crystals and appear thin or wispy.
- Stratocumulus and Nimbostratus is Incorrect: Stratocumulus and Nimbostratus are primarily classified as Low clouds (forming below 2 km). While Nimbostratus are thick, rain-bearing layers that can obscure the sun, they lack the distinct vertical, tower-like structure of Cumulonimbus clouds.
Key Takeaway:
Clouds with extensive vertical development (Cumulus and Cumulonimbus) are distinct from horizontal layered clouds (Stratus family) and are driven by strong convection currents, resulting in significant vertical height.