I think is alternative a because that includes the earth
<h3>Consequences of soil erosion</h3>
Soil erosion decreases agricultural productivity, degrades ecosystem functions, amplifies hydrogeological risk such as landslides or floods, causes significant losses in biodiversity, damage to urban infrastructure and, in severe cases, leads to displacement of human populations.
1739 by Jean Baptiste Charles Bouvet De Lozier
a drop of water may spend over 3,000 years in the ocean before moving on to another part of the water cycle
