This simulation contains rock layers and fossils from several different locations. Arrange the rock layers in the correct order, from the oldest at the bottom to the youngest at the top. Once a fossil disappears, it’s gone from the fossil record and does not reappear.
ill give brainlist if your answer is correct.

Answer: A valuable index fossil must be distinctive or easily recognizable, abundant, and have a wide geographic distribution and a short range through time.

Explanation:

An index fossil is any animal or plant preserved in the Earth's rock record that is characteristic of a particular span of geologic time or environment. A valuable index fossil must be distinctive or easily recognizable, abundant, and have a wide geographic distribution and a short-range through time. Index fossils are the basis for defining boundaries in the geologic time scale and for the correlation of strata. In marine strata, index fossils that are commonly used include the single-celled Protista with hard body parts and larger forms such as ammonoids. In terrestrial sediments of the Cenozoic Era, which began about 65.5 million years ago, mammals are widely used to date deposits. These animal forms have hard body parts, such as shells, bones, and teeth, and evolved rapidly.

Answer:

Ammonites, trilobites and graptolites are often used as index fossils.

Mass extinction can be identified by traces in the fossil record. The strata corresponding to this time period contain a variety of life forms when compared to a younger layer. it can be inferred that mass extinction is a possibility.

Explanation:

Answer:

Scientists use a geologic time scale to illustrate the order in which events on Earth have happened.

Explanation:

Scientists can use the geologic time scale to determine the order in which several events on Earth have happened or taken place.

The geologic time scale can be described as a representation of time based on the rock record of Earth and is a system of chronological dating that uses chronostratigraphy and geochronology.

The geologic time scale can be used by scientists to observe changes in the fossils by examing the oldest to youngest sedimentary rocks or layer by layer.

The geologic timescale also used relative dating to divide Earth’s past into many layers of time and utilized absolute dating to know the actual number of years ago that specific occurrences took place.

Relative dating does not show any specific dates but it allows us to know if a fossil or stratigraphic layer is older than another while Absolute dating methods provide more specific origin dates and timelines.

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1) In this neutralization reaction, HCl is an acid and NH4OH is a base.

The reaction between an acid and a base to form a salt is called neutralization reaction. For the given reaction, HCl is the acid and NH₄OH is the base. Hence, option D is correct.

Acids and bases reacts together to form salts having no acidity or basicity.  This type of reactions are called neutralization reactions. There are different concepts for defining acids and bases.

According to Lewis concept, acids are substances which donate electrons or negative ions. Then, bases are substances which accept electrons and negative ions or furnish  positive ions to the acids.

Here, HCl is the acid which donate the negative ion Cl - to the base NH₄OH and forms water and NH₄Cl. Therefore, HCl is the acid and NH₄OH is the base in the given neutralization reaction.

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Answer:

you can yes soap because the chemicals are safe in it

Explanation:

bleach you can not yes because but has wires cgemucaks than soap

Soap is a weaker base than bleach and it has more hydronium ions than bleach. It lies closer to a neutral pH. Therefore, option (A) is correct.

An acid is capable of donating a proton to another substance and is generally identified by its sour taste.  A base is capable to accept a hydrogen ion from acid and is characterized by a bitter taste and a slippery texture.

Acids can turn blue litmus paper into red while Bases can turn red litmus paper into blue. A base can dissolve in water and when bases chemically react with acids, yield salt, and water as products.

pH = -log [H⁺]

The pH value of the bases lies between 7 to 14. The more the pH value stronger will be the base. The concentration of hydronium ions will be less if the pH value is higher. Therefore, soap has less pH value so it has more hydronium ions.

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Answer: D and it should be C or A I'm second guessing-

Explanation:

Because the Earth is round, the frigid polar regions never get a high sun, and because of the tilted axis of rotation, these areas receive no sun at all during part of the year. The Earth revolves around the sun in an elliptical orbit and is closer to the sun during part of the year. When the sun is nearer the Earth, the Earth's surface receives a little more solar energy. The Earth is nearer the sun when it is summer in the southern hemisphere and winter in the northern hemisphere.

Earth is described as an open system and due to gravity matter cannot move freely and the correct options are option B and D.

Earth can be described as an open system due to its interactions with its surroundings. It receives solar radiation from the sun, which provides energy to sustain various processes on Earth. This energy drives the Earth's climate, weather patterns, and the cycling of substances such as water, carbon, and nutrients. However, Earth is not a closed system because it exchanges matter with its surroundings.

For example, it gains meteorites and cosmic dust from space and loses gases, such as hydrogen and helium, from its upper atmosphere.

Additionally, Earth's gravity holds its atmosphere and prevents the escape of gases and most solid materials into space. Thus, Earth's system is characterized by the exchange of energy and matter within the constraints of gravity.

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