Dr. Kate Brauman stated that it is difficult to know precisely how much water there is globally, because (select both correct answers for full points):

Question

BlackTom AI · Accepted Answer

The question asks which two statements explain why it is difficult to know precisely how much water there is globally, and it notes that two options are correct for full points.
Option 1: 'Streamflow measurements are sparse, globally.' This is a plausible reason because many river basins, especially in remote or under-monitored regions, lack continuous, long-term streamflow data. Sparse data make it hard to integrate total water discharge across the globe and to close the water balance for large regions.
Option 2: 'It's difficult to get good flow measurements on larger rivers because of flow variation.' Large rivers exhibit substantial variability in flow due to seasonal changes, storm events, dam releases, and other hydrological processes. This variability complicates measurements because a single reading may not represent typical conditions, and capturing representative flows requires extensive, repeated measurements and sampling.
Why these are correct in combination: Together, global water accounting relies on representative streamflow data across many basins and times. If many streams are not measured (Option 1) and the measurements that exist for large rivers are themselves highly variable (Option 2), then estimating total global water volumes becomes highly uncertain.
Why other hypothetical statements (if present) might be incorrect: If a statement claimed that global water quantity is well-known or that flow measurements are uniformly collected everywhere, it would contradict the reality of uneven monitoring networks and natural hydrological variability. If it suggested that only small rivers matter, or that flow variation is negligible, those would mischaracterize the heterogeneity and dynamics of global hydrology.
Note: The provided data does not include explicit answer options beyond the two listed statements, so the analysis focuses on evaluating these two reasoning threads in isolation and in combination.

Dr. Kate Brauman stated that it is difficult to know precisely how much water there is globally, because (select both correct answers for full points):多项选择题

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