which fossilized organisms are most likely found in earths lowest layers of rock
a. dinosaurs
b. bacteria
c. snails
d. retiles
The correct answer is b. bacteria.
The lowest layers of rock, also known as the Precambrian era, date back over 600 million years ago. During this time, complex organisms like dinosaurs, reptiles, and snails had not yet evolved. Instead, the fossilized organisms found in these lower layers of rock are primarily single-celled prokaryotic bacteria.
a model shows that the moon has grown to twice its size, yet it remained in the same place. in one to two sentences, explain how this would impact the gravity between earth and the moon
If the moon were to double in size while remaining in the same place, the impact on the gravity between Earth and the moon would be negligible since an object's gravitational force depends on its mass and distance, not its size.
a students wants to draw a scale model of the solar system. in three to four sentences or bullet points, explain what steps should be taken to create this model
To create a scale model of the solar system, the following steps can be taken:
1. Determine a suitable scale: Decide on a scale that fits the available space and resources. For example, using a scale of 1:1 billion could represent 1 meter as 1 billion meters (approximately the average distance between the Earth and the Sun).
2. Establish the sizes and distances: Research and gather accurate data on the sizes and average distances of the planets from the Sun. Convert these measurements to fit the chosen scale.
3. Choose suitable representations for the planets: Decide how to represent each planet in the model—using objects like different sized balls, pieces of fruit, or printing out scaled images.
4. Arrange the planets in their respective distances: Position each planet at its calculated distance from the Sun, ensuring they are correctly spaced according to the scale.
5. Add other elements: Consider including other features like asteroids, comets, or moons. Research their sizes and average distances from their respective planets and include them in the model accordingly.
6. Label and display: Label each planet and additional elements with their names and information. Create a display or layout that showcases the entire model accurately.
Remember, due to the vastness of space, creating an accurate scale model of the solar system may require significant adjustments to fit within the available space and resources.
write three to four sentences
To create a scale model of the solar system, first, choose a suitable scale such as 1:100 or 1:1 billion. Then, gather accurate information about the sizes and distances of the planets from the Sun. Convert these measurements to fit the chosen scale, and choose appropriate representations for the planets, using objects like balls or printed images. Arrange the planets in their respective distances from the Sun according to the scale, and label each planet with its name and relevant information.
in three to five sentences, explain the evidence that supports the idea that water on earth may have come from comets
The idea that water on Earth may have come from comets is supported by several lines of evidence. First, isotopic analysis of water molecules on Earth and in comets shows a match, suggesting a similar origin. Second, the ratio of deuterium to hydrogen in water on Earth and in comets is consistent, further suggesting a common source. Third, the discovery of organic molecules and complex organic compounds in comets supports the idea that they could have brought both water and building blocks of life to Earth. Lastly, the presence of ancient impact craters on Earth provides evidence of intense bombardment by comets, offering a plausible delivery mechanism for water.
Which statement best describes the difference between a theory and a law?
1 point
Scientific theories explain WHY a phenomenon occurs, and a scientific law explains WHAT occurs.
Scientific theories explain WHAT occurs, and a scientific law explains WHY a phenomenon occurs.
They both explain why something happens
They both tell us what happens