QCM : Water's Journey: States, Cycle, and Conservation — 5 questions

Explication

The solid state of water is ice, where molecules are tightly packed in a fixed structure, forming a solid. This is different from liquid water, where molecules are loosely packed and flow, and from water vapor, where molecules are spread out and move freely.

Explication

Evaporation is primarily driven by heat from the Sun, which provides the energy needed for water molecules to change from liquid to vapor. This is explicitly stated in the content, making it the correct answer. The other options are plausible but not the main energy sources for evaporation: the Earth's magnetic field and moon's gravity do not influence evaporation, and wind energy affects other processes like transpiration but not the fundamental energy source for evaporation.

Explication

Water's unique properties, including polarity, cohesion, and high specific heat, play a crucial role in supporting life processes and maintaining environmental stability by enabling essential functions like nutrient transport, temperature regulation, and habitat formation.

Explication

The awareness about water conservation as a crucial environmental issue gained significant prominence during the 1960s, coinciding with the rise of modern environmental movements that emphasized sustainable resource management.

Explication

Point source pollution originates from a single, identifiable source, such as a factory pipe, making it easier to control and regulate. Non-point source pollution comes from multiple, diffuse sources like runoff from agricultural fields or urban areas, making it more challenging to manage. This fundamental difference in origin is what sets them apart.