If you "run the clock backwards" using the Friedmann equations, you can avoid a singularity; you just need the pressure and energy to behave in the right way when the Universe was very hot and dense. The catch is that "the right way" in this case means that ρ+3p<0; in other words, either the energy density or the pressure (or both) have to be negative. No conventional forms of matter are known that satisfy this inequality, so unless something really strange was going on in the early Universe, there must have been an initial singularity. (Or, more plausibly, there was a time in the early Universe where the spacetime curvature was sufficiently large that the laws of GR as we know them did not apply.)
Explanation:
The 4 major characteristics of a mineral are: -It is formed by natural processes- not man made -It is inorganic- it's not alive, it never will be -It is a crystalline solid- a definite volume and shape with a repeating structure, It can be an element or compound with a definite chemical composition ,made the same each time w/ and orderly arrangement of atoms Also, another answer might <span>be: -Texture -Hardness -Luster or shine -Color/streak Hope
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Answer:
By the mid-19th century, industrialization was well-established throughout the western part of Europe and America's northeastern region. By the early 20th century, the U.S. had become the world's leading industrial nation.
Answer:
a) The existence of the supercontinent Pangea led to a high degree of geographic uniqueness (endemism) among species during the Late Triassic. ==>FALSE
b) The Jurassic Period marks the time when dinosaurs began to dominate among terrestrial vertebrates. ==> TRUE
c) The scarcity of sediments from the Middle Jurassic may explain the apparent decrease in dinosaur diversity during this time. ==> TRUE
d) Mammals and dinosaurs co-existed throughout the Jurassic and Cretaceous Periods. ==>TRUE
e) The greatest leap in dinosaur diversity occurred during the Jurassic Period. ==> FALSE
f) There is a correlation between the rise of angiosperms and the diversity of herbivorous dinosaurs during the Cretaceous Period. ==> TRUE
g) There is a significant body of evidence suggesting that dinosaur evolution was responsible for the simultaneous evolution of angiosperms.==>FALSE
The last chose about Greece. With 98%
