Answer:
Approximately 4.5 billion years ago (The Hadean Eon) .
Explanation:
The Geologic Timescale's "Hadean" era, named for Hades (Hell, well, we weren't feeling very imaginative that day), encompasses the Earth's origins. According to the evidence we currently have, the Earth's surface at that time was mostly made up of lava lakes and molten rock.
How would that appear? The first 500 Ma of Earth's history have left very little stuff behind. You may, however, take a peek at our moon, which similarly went through a lava lake period before freezing. You'll see that it has both dark and bright landscape.
The lighter material is known as highlands and is primarily composed of anorthosite. Anorthose, a kind of plagioclase feldspar, is the main component of the igneous rock known as anorthosite. According to what we know, the Moon too had a lava lake era. Liquid rocks exposed at the surface were cooling and fractionally crystallizing throughout this lengthy period. A certain order of minerals was developing. And these minerals were dividing up according to the density of the melt; less dense minerals, like plagioclase (Anorthose is a plagioclase), floated to the surface in a sort of incandescent crystal slush slurry and formed a sort of lid there. Denser minerals, like olivines, were sinking to the bottom of the lava lake to form cumulates. As the lava lakes cooled, anorthosite piled on top in successive layers, thickening the mass of floating crystals. Large meteor impacts occasionally pierced this anorthosite crust, and part of the thicker (and darker) underlying liquid accumulated in the ensuing craters to produce those roundish dark patches (Maria), which are now filled with basalt.
After the lava lakes froze/crystallized over, such characteristics were maintained since there was no significant tectonic activity on the Moon (except for the local meteor impacts which screw things up a bit).
Explanation:
Because we always seek to make sense of any perceived stimulus to better understand the reality that surrounds us and act before it. Through perception we process information from the senses, with which the brain builds and tries to give meaning to those stimuli that reach it. However, each person captures, selects and organizes sensory stimuli differently and, therefore, arrives at different interpretations and responses when solving a problem, in which memory and experience also form a fundamental role. Thus, differences between perceptions help explain how people interpret the environment and why they behave differently in the same situation. For example, when we recognize a specific object, an action can be initiated, in which a motor activity is propitiated in response to that recognition, and which can be different in each person.
Answer: The Earth is made up of three different layers: the crust, the mantle and the core.
Explanation: brainliest??? UwU
28. A scientific theory explains an aspect of the natural world and can be tested repeatedly using the scientific method or experiments. This means that the explanations or content of a scientific theory is based on evidence gained through observation or experimentation.
The answer is True.
29. Scientific law is a statement that describes a a phenomenon that has been observed in repeated experiments. These statements are verified through the scientific method. Laws do not change; rather, they are applied to expand or broaden certain aspects.
30. Experiments are done to support, refute or validate existing theories. They show cause and effect insight through demonstration. These theories then may bring about laws in the scientific field.
The answer is then True.
31. I would get the Refrigerator A. The cost of running Refrigerator A is $10.00 a month, while B is $15.00 a month. This means the energy consumption is less with refrigerator A. Although B is cheaper, the energy consumption is much higher. In the long run, refrigerator A, would be a better investment.
32. Patterns of stars in the sky are called constellations. Constellations are a group of stars that form a recognizable pattern that is traditionally named after the mythological figure or whatever thing, animal or person that resembles the pattern.
The answer is B.
33. Ancient Greeks and Romans believed that the patterns in the sky represented mythological characters and animals. Examples of such would be Aries, Cancer, Capricornus, and the Big dipper. Romans mythology also depicts other celestial bodies as their gods, like mercury after the messenger god; Venus, the goddes of love and beauty.
The answer is C.
34. The sun in the solar system is a star. In fact, a star is considered or is called a sun if it is the center of a planetary system. Our own sun is the largest object that you can find in our solar system.
The answer is B.
35. The sun, is the closest star to Earth specifically. It is about 93 million miles away. It is brighter than the other stars because of its closeness. It makes up 99.8% of the total mass of our solar system.
The answer is B.
36. Light from the sun travels at the speed of light. It takes 8 minutes and 20 seconds for it to travel from the sun to the surface of the Earth at an average. It varies at times because the orbit of the Earth is elliptical.
The answer is A.
Decreasing levels of __progesterone__ lead to sloughing, or shedding, of the endometrial lining.
