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What kinds of things do scientists date using Radiometric dating with Uranium-238? Why?
Scientists believe the first oxygen came from bacteria that lived all over the oceans.
Scientists believe the earth was formed after the Big Bang, when debris was flying everywhere.
From the earth, meteorites, and the moon
Only Rocks because Uranium takes a long time to decay, so it can date really old rocks.
4.54 billion years
Only fossils because rocks were never living, so they don't lose Carbon 14 over time.
Oldest rocks are on bottom, youngest rocks are on top AND layers that cut through others are younger
Differentiated means that the earth formed its layers (of different densities).
What does it mean that the earth “differentiated”?
Scientists believe the first oxygen came from bacteria that lived all over the oceans.
Scientists believe the earth was formed after the Big Bang, when debris was flying everywhere.
From the earth, meteorites, and the moon
Only Rocks because Uranium takes a long time to decay, so it can date really old rocks.
4.54 billion years
Only fossils because rocks were never living, so they don't lose Carbon 14 over time.
Oldest rocks are on bottom, youngest rocks are on top AND layers that cut through others are younger
Differentiated means that the earth formed its layers (of different densities).
When scientists look at many layers of rock on top of each other, how do they figure out which are the oldest and youngest layers?
Scientists believe the first oxygen came from bacteria that lived all over the oceans.
Scientists believe the earth was formed after the Big Bang, when debris was flying everywhere.
From the earth, meteorites, and the moon
Only Rocks because Uranium takes a long time to decay, so it can date really old rocks.
4.54 billion years
Only fossils because rocks were never living, so they don't lose Carbon 14 over time.
Oldest rocks are on bottom, youngest rocks are on top AND layers that cut through others are younger
Differentiated means that the earth formed its layers (of different densities).
How old do scientists believe the earth is?
Scientists believe the first oxygen came from bacteria that lived all over the oceans.
Scientists believe the earth was formed after the Big Bang, when debris was flying everywhere.
From the earth, meteorites, and the moon
Only Rocks because Uranium takes a long time to decay, so it can date really old rocks.
4.54 billion years
Only fossils because rocks were never living, so they don't lose Carbon 14 over time.
Oldest rocks are on bottom, youngest rocks are on top AND layers that cut through others are younger
Differentiated means that the earth formed its layers (of different densities).
What kinds of things do scientists date using Radiometric dating with Carbon-14? Why?
Scientists believe the first oxygen came from bacteria that lived all over the oceans.
Scientists believe the earth was formed after the Big Bang, when debris was flying everywhere.
From the earth, meteorites, and the moon
Only Rocks because Uranium takes a long time to decay, so it can date really old rocks.
4.54 billion years
Only fossils because rocks were never living, so they don't lose Carbon 14 over time.
Oldest rocks are on bottom, youngest rocks are on top AND layers that cut through others are younger
Differentiated means that the earth formed its layers (of different densities).
What do scientists believe produced the first BREATHABLE amounts of oxygen?
Scientists believe the first oxygen came from bacteria that lived all over the oceans.
Scientists believe the earth was formed after the Big Bang, when debris was flying everywhere.
From the earth, meteorites, and the moon
Only Rocks because Uranium takes a long time to decay, so it can date really old rocks.
4.54 billion years
Only fossils because rocks were never living, so they don't lose Carbon 14 over time.
Oldest rocks are on bottom, youngest rocks are on top AND layers that cut through others are younger
Differentiated means that the earth formed its layers (of different densities).
How do scientists believe the earth was formed?
Scientists believe the first oxygen came from bacteria that lived all over the oceans.
Scientists believe the earth was formed after the Big Bang, when debris was flying everywhere.
From the earth, meteorites, and the moon
Only Rocks because Uranium takes a long time to decay, so it can date really old rocks.
4.54 billion years
Only fossils because rocks were never living, so they don't lose Carbon 14 over time.
Oldest rocks are on bottom, youngest rocks are on top AND layers that cut through others are younger
Differentiated means that the earth formed its layers (of different densities).
To determine the age of the earth, scientists dated rocks from where?
Scientists believe the first oxygen came from bacteria that lived all over the oceans.
Scientists believe the earth was formed after the Big Bang, when debris was flying everywhere.
From the earth, meteorites, and the moon
Only Rocks because Uranium takes a long time to decay, so it can date really old rocks.
4.54 billion years
Only fossils because rocks were never living, so they don't lose Carbon 14 over time.
Oldest rocks are on bottom, youngest rocks are on top AND layers that cut through others are younger
Differentiated means that the earth formed its layers (of different densities).
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