Arrange hydrological elements into a simple causal chain: Items: (a) Evaporation (b) Rain (c) Sea (d) Clouds Choose the correct sequence starting from the sea.

Introduction / Context:
A basic hydrological sequence shows how water moves from seas to atmosphere and back.

Given Data / Assumptions:

• Sea (c) is the starting reservoir.
• Evaporation (a) lifts water as vapour.
• Clouds (d) form aloft.
• Rain (b) returns water to the surface.

Concept / Approach:
Track the physical processes in order of occurrence from the specified start.

Step-by-Step Solution:

Verification / Alternative check:
Evaporation cannot occur after rain in a single forward pass; clouds precede rain.

Why Other Options Are Wrong:

• Orders starting with rain or clouds ignore the chosen starting reservoir.

Common Pitfalls:
Interchanging condensation/evaporation; this item only names evaporation explicitly.

Final Answer:
c, a, d, b