Question

in this lab, you observed how different factors such as velocity, gradient, and \boxed{}, or amount of water in a stream, affect the rate of \boxed{}, the transport of materials from one area to another by water.

Explanation:

For the first blank, the term related to the amount of water in a stream is "discharge" (as discharge refers to the volume of water flowing in a stream over time, which is the amount of water). For the second blank, the transport of materials by water is "erosion" (or "transportation" in the context of stream processes; erosion involves the movement of materials, and transportation is the actual moving of sediments, but erosion is also a process that includes transport. However, more accurately, the process of transporting materials by water is "transportation" or "erosion" — but in the context of stream processes, the transport of materials is often referred to as "sediment transport" or simply "transportation", but the key term here related to the movement of materials by water is likely "erosion" or "transportation". Wait, actually, the definition given is "the transport of materials from one area to another by water" — that is "transportation" or "erosion" (since erosion includes detachment and transport). But the standard term for the transport of materials by water is "sediment transport" or "transportation". However, in the context of the lab, the first blank: the amount of water in a stream is "discharge" (discharge = velocity × cross - sectional area, so it's the volume of water per unit time, i.e., the amount of water). The second blank: the transport of materials by water is "erosion" (or "transportation"). But let's confirm:

1. First blank: The amount of water in a stream is described by "discharge" (it's the volume of water flowing past a point per unit time, so it's the "amount" of water in terms of flow).
2. Second blank: The transport of materials from one area to another by water is "erosion" (or "transportation"; erosion involves the wearing away and moving of materials, and transportation is the actual movement. But the definition here is "the transport of materials... by water", so "transportation" or "erosion". However, in many earth science contexts, the process of moving sediments by water is part of "erosion" (the erosion process includes detachment, transport, and deposition) or "sediment transport". But for a basic lab context, the first blank is "discharge" (since discharge is the volume of water, i.e., the amount), and the second blank is "erosion" (or "transportation"). But more accurately, the first blank: "discharge" (as it's the measure of the amount of water in a stream's flow), and the second blank: "erosion" (or "transportation"; but the definition given is the transport, so "transportation" or "erosion". However, the key terms here are:

First blank: discharge (amount of water in a stream, i.e., stream discharge)

Second blank: erosion (or transportation; but erosion is the process that includes the transport of materials)

So filling in:

First blank: discharge

Second blank: erosion (or transportation; but in the context of stream processes, the transport of materials by water is often referred to as "sediment transport" or "transportation", but "erosion" is also correct as erosion involves moving materials)

Answer:

First blank: discharge
Second blank: erosion (or transportation; more accurately, "transportation" or "erosion", but "erosion" is a common term here)

(Note: If we follow the most common terms in earth science labs:
First blank: discharge (the amount of water in a stream, measured as volume per unit time)
Second blank: erosion (the process that includes the transport of materials by water, or "transportation" as the transport itself))