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2 years ago

As a river transitions to less steep land, it gets wider and slower and

Biology

1 answer:

kakasveta [241]2 years ago

7 0

In rivers, a transition occurs from the highest course to the medium and lowest course. When a river transitions to less steep land, it gets wider and slower and contains more oxygen, nutrients, and fewer algae blooms.

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A river is composed of three main courses:

The highest course is near the source.
The medium course, where there is a low slope. There is a decrease in the speed of the waters, the erosive effect, and the dragging capacity. The flow increases due to the contribution of tributaries. The valley widens.
The low course is near the mouth, where the slope is low, and the river speed decreases notoriously. There are wider valleys -plains- and wide meanders. The most characteristic feature of this part of the river is the deposit of the last materials that have been uprooted and transported in the previous phases. Hight sedimentation degree.

When a river transitions to less steep land, getting wider and slower, it contains more oxygen, more nutrients, and fewer algae blooms.

This occurs because sunlight reaches the bottom in those areas with less steepness. As the current is not that strong, many vegetable species can grow and photosynthesize, attaching to the bottom and not being pulled up by the stream.

The existence of more vegetable species -especially near the shore- means a higher photosynthetic rate, which also means more oxygen available. As we already know, during the photosynthesis process, oxygen is released from water molecules. So, the more photosynthetic species grow in these rivers, the more oxygen is available.

More plants growing in shadower areas also means more refuge available for invertebrates and small vertebrates. Many animal species can find shelter and a source of food in fewer steep lands, especially small species.

As biodiversity increases, it also increases organic matter and nutrients available for plants and animals. Sediments might accumulate in the bottom.

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The independent variable is the one that causes an effect on the dependent variable. In this case, the independent variable is depth. Different depths lead to a variation in temperature. 2) depths.

<h3>What are de dependent and independent variables?</h3>

Independent variables are those modified or changed by the researcher to study how this change affects another variable and hence the results.

This variable is not affected by any other one but influences or causes a reaction in other variables.

The dependent variable is the one influenced by the independent variable, and is affected by any change on this last one.

Its response might be either directly proportional or inversely proportional to the change in the independent variable.

Now let us answer the question.

The aim of the study was probably to analyze how temperature changed with depth.

So, according to this, depth influenced on the temperatureof water.

The independent influencing variable is depth.
The dependent affected variable is water temperature.

The correct option is 2. depths.

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Students measured the temperature of the water at different depths in Lake Skywalker and found that the temperature varied. Which is the independent variable?

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2 years ago

A 6,000 kg train car is moving to the right at 10 m/s and connects to a 4,000-kg train car that wasn't moving. What is the veloc

SIZIF [17.4K]

6 m/s

This type of collision is a Inelastic collision

Explanation:

We begin by finding the momentum of the initial train car;

Remember that momentum is given by the formulae mass (kg) * velocity (m/s)

Therefore;

Momentum = 6000 * 10

= 60,000 kg⋅m/s

The other car has zero momentum because;

4000 * 0

= 0

When the two train cars collide, the total momentum will be;

60,000 + 0 = 60,000

Therefore to find the velocity, well use the same formulae;

p = mv whereby;

p – momentum

m – mass

v – velocity

60,000 = (6000 + 4000) * v

v = 60,000 / 10,000

v = 6

= 6 m/s

This is an elastic collision because we are assuming that no energy is lost in the collision. Most collisions, however, are not elastic but rather inelastic. In inelastic collision some of the kinetic energy is lost to the environment in some other form of energy such as heat energy.

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