Workspace▸ Science▸ Test 106
← Back to Science
Science · Drill 106

Science practice 106

7 questions ~9 min recommended
⏱ 00:00
Score
—
I notice the passage you provided appears to be just a list of temperature values (722°C, 20°C, 18°C, 9°C, 8°C, 6°C) with no actual text content or underlined portions marked with question numbers. The questions reference concepts like thermocline, stratification, and seasonal turnover, which suggests this passage should contain descriptive text about a lake's temperature layers. However, the passage text itself is missing. To properly format this as HTML with underlined portions and subscript question numbers, I would need: 1. **The actual passage text** — the prose or description that discusses these temperatures, thermocline, water layers, seasonal changes, etc. 2. **Question markers** — the standalone digits (1, 2, 3, 4, 5, 6, 7) embedded in the passage text showing where the underlined portions occur. Could you provide the complete passage text (the actual sentences/paragraphs from the ACT English test) along with the temperature data? Once I have that, I can render it as properly formatted HTML with `` and `` tags in the exact format requested.

PASSAGE VII

The Great Lakes-Huron, Ontario, Michigan, Erie, and Superior-form the largest freshwater system in the world. Each of the lakes tends to stratify, or form layers of warmer and colder water, depending on the season. This is called seasonal turnover. In winter, for example, the coldest water in the lake lies just below the surface ice. The water gets progressively warmer at deeper levels. In spring, the sun melts the ice, and the surface water warms. Because the surface water is still cooler than the layers below, the water at the surface sinks to the bottom of the lake, forcing the cooler water at the bottom of the lake to the surface. This mixing, known as spring turnover, eliminates the temperature stratification that was established during the winter. In the absence of this thermal layering, wind continues to mix the water to a greater depth, bringing oxygen (O2) to the bottom of the lake and nutrients to the surface. This results in a relatively even distribution of O2 throughout the lake. When summer arrives, the lake again becomes stratified, with warm water at the surface, and cold water at the bottom. A narrow zone of water undergoing rapid temperature changes separates these layers. This zone is called the thermocline. Cool, fall temperatures cause the lake water to mix again, until the surface begins to freeze and the winter stratification is reestablished.

The stability of the lake's stratification depends on several factors: the lake's depth, shape, and size, as well as the wind and both the inflow and outflow of lake water. Lakes with a lot of water flowing into and out of them do not develop consistent and lasting thermal stratification.

Figure 1 shows an example of lake stratification during the summer.

Figure 1 Cross-section of a lake during the summer.

1. According to Figure 1, the temperature of the water below the thermocline is:

2. Based on the passage, which of the following best represents O2 levels in one of the Great Lakes during the spring?

3. According to the passage, the thermocline is:

4. According to the passage, Lake Michigan experiences thermal stratification during:

5. A small, inland lake, fed by a fast-flowing river was found to have very little thermal stratification. Based on the passage, this is most likely because:

6. According to Figure 1, during the summer, as the depth of the lake increases, the temperature of the water:

7. Based on the passage, the stability of thermal stratification depends on all of the following EXCEPT:

← Prev test Next test →
Jump to