Answer:
Heavy bombardment, solar wind, condensation, frost line, planetesimal, accretion, solar nebula, radiometric dating
Explanation:
The first few hundred million years of the solar system 19s history were the time of the <u>heavy bombardment</u>, during which Earth suffered many large impacts.
The era of planet formation ended when the remaining hydrogen and helium gas of the solar nebula was swept into interstellar space by the <u>solar wind</u>.
Ice can form from a gas through the process of <u>condensation</u>.
Hydrogen compounds in the solar system can condense into ices only beyond <u>frost line</u>.
Our Moon was most likely formed by a collision between Earth and a Mars-sized <u>planetesimal</u>.
Mars was formed by the <u>accretion</u> of smaller objects.
Our solar system was created by the gravitational collapse of the <u>solar nebula</u>.
<u>Radiometric dating</u> allows us to determine the age of a solid rock.
Answer:
Scientists believe that plate tectonics is an example of an internal force that changes the Earth’s crust.
Plate tectonics is a theory that describes the motion of seven large plates, and many other smaller plates of the Earth's lithosphere. When they collide they can make mountains or we can feel their motion as earthquakes. Their motion is responsible for the continental shift and it made our continents look the way they look today.
Answer:
grew crops as a food source
Extinction may occur naturally as a result of a calamity, ongoing environmental stress, or ecological interactions like competition, sickness, or predation.
This occurs when a species' population gradually but steadily decreases at the conclusion of its time of development on Earth. Many North American mammals went extinct during the end of the last ice age, 10,000 years ago, including mammoths, mastodons, and glyptodonts. In addition to climatic change, overhunting by humans was another contributing cause, according to paleontologists' evidence. The phrase "extinction" refers to the end of a particular type of organism or a set of types, typically a species. Although the ability to reproduce and bounce back may have been lost earlier, the death of the last member of the species is typically considered to be the moment of extinction. Determining this point is challenging because a species' potential range may be quite wide, and is typically done after the fact. Due to this problem, there are phenomena like Lazarus taxa, in which a species that was thought to be extinct suddenly "reappears" after a period of apparent absence (usually in the fossil record).Estimates place the number of extinct species at over five billion, or more than 99% of all species that have ever existed on Earth. There are now about 8.7 million species of eukaryotes in the world, and if bacteria and other microbes are included, there may be many times more. Non-avian dinosaurs, saber-toothed cats, dodos, mammoths, ground sloths, thylacines, trilobites, and golden toads are a few notable extinct animal species.
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