![tishfaco5000](/avatars/30360.jpg)
tishfaco5000
18.10.2019 •
Biology
Meteorites have been investigated by scientists over the past two centuries. the chemical elements they contain have been analyzed and what is most remarkable is that the chemical composition of chondritic meteorites is almost exactly the same as the chemical composition of the sun when gases like hydrogen and helium are not included in the comparison. their composition infers that they were made from the same original batch of material. the earth, which lies between the sun and the asteroid belt, the source of these meteorites, is believed to have been made from the same material as well. theory states that the sun and planets came into existence when part of an enormous cloud of gas and dust, drifting in the milky way galaxy, became unstable and collapsed inwards on itself under the influence of its own gravity. the dust in the cloud had the same chemical composition as the sun and chondritic meteorites. gravity brought most of the gas and dust together in a single central mass but some of the gas and dust became spread out in a flat disk rotating around the sun. the dust included an abundance of olivine-rich grains and bits of metal and it eventually clumped together to form larger objects, ending with planets and asteroids, all orbiting the sun. the gas was lost from the asteroids and the inner, terrestrial planets because their gravity was too weak to hold on to it, but the gas did stick to jupiter and the other icy-cold giant planets beyond.
earth began as a mixture of about 90% stony, olivine-rich material and about 10% iron metal, just like the composition of chondritic meteorites. soon after its formation the interior of the earth is thought to have become very hot. what was the result of this increase in heat?
a)
the iron melted and collected in the interior of earth to become its core.
b)
the olivine remained behind, becoming the mantle and the melted iron became the core.
c)
both the olivine and iron melted and as they later solidified, became the mantle and the core.
d)
the olivine became the crust and the iron, melting, defended into the earth to become the core.
Solved
Show answers
More tips
- L Legal consultation What Documents Are Required for a Russian Passport?...
- S Sport How to Choose Tennis Rackets?...
- H Health and Medicine AKDS Vaccination: Ensure Your Child s Safety...
- H Health and Medicine Naskol ko Opasen Ukus Kleshcha i Kak Ego Raspoznat...
- C Computers and Internet How to Delete Your Account on Odnoklassniki...
- H Health and Medicine What to Do When Your Jaw Locks Up?...
- G Goods and services What Are the Most Popular Services?...
- P Philosophy How did the concept of module arise in computer science?...
Answers on questions: Biology
- B Biology Human activities are causing the fragmentation of the brazilian atlantic rain forest. one consequence is that toucans have become extinct or nearly extinct in some of the forest...
- B Biology In which of the following ways are dna and mrna similar? a) they are both always kept in the nucleus to keep them safe from damage. b) they are both double stranded and must...
- B Biology The chemical reactants on the left produce on the right. adp p energy - question 17 options: adp atp gag stp...
- B Biology Which of the following best describes the what happens during gene expression? a. a cell reads the instructions in dna and builds a protein based on those instructions. b....
- B Biology which of the following is true for compounds? plz...
- B Biology What percentage of acres were devoted to HT corn in 1999? What percentage of acres were devoted to HT soybeans in 2005? Genetically modified crops have drastically in recent...
- B Biology Biofuel is any fuel that is produced from living or once-living matter in a short period of time, days, weeks, or even months. This contrasts with fossil fuels, which take...
- B Biology What happens to energy that is not used by producers? Provide an example of an animal who consumes producers....
- B Biology Marvin blows up a balloon but lets go of it. the air inside is released and the balloon goes up into the air. what best describes what happens?...
- B Biology What happens between alleles between the p generation and the f 2 generation...
Ответ: