Assertion: lake | /r/HasSubevent | no alteration of ph. systems
Facets:
value: without this bedrock
type: OTHER
Source sentences:
text: Lakes and ponds that contain bedrock that is rich in carbonates have a natural buffer, resulting in no alteration of pH. Systems without this bedrock, however, are very sensitive to acid inputs because they have a low neutralizing capacity, resulting in pH declines even with only small inputs of acid.