All Questions
8
questions
0
votes
1
answer
227
views
Why don't scientists believe Earth's surface water came up from the mantle?
I read, periodically, that there is more water trapped in the mantle than there is in the oceans - possibly a lot more.
If so, why don't any geologists believe that Earth's surface and near-surface ...
- 5,307
2
votes
3
answers
1k
views
Was the young Sun cooler or hotter than it is today?
Generally, astrophysicists say that the young Sun was only about 70% as warm as today, which leads to the alleged 'Faint young Sun paradox' about how a young Earth could have been as warm as it (again,...
- 5,307
2
votes
0
answers
75
views
Has the computed change of the axial tilt ever been measured?
Earth, the 3rd planet from the Sun, sometimes faces earthquakes and seaquakes that are so strong that they reportedly change the axial tilt and/or the rotation velocity. These changes are merely ...
- 1,090
2
votes
1
answer
433
views
How significant is a planet's density to the formation of life?
I'm doing some writing set on a fictional earthlike planet that for reasons needs to be substantially larger than Earth but can't have substantially higher gravity. I've been able to compromise with a ...
- 129
2
votes
1
answer
959
views
Radioactive decay is the main source of the earth's interior heat: fact or theory? [closed]
It's believed the main reason that the interior of the Earth hasn't cooled down in 4 billion years is because of the ongoing decay of radioactive elements that keeps adding more heat than is lost to ...
6
votes
2
answers
206
views
Would it be possible to calculate the expected frequency of impact craters of all sizes on Earth
Can the expected frequency of all sizes of impact craters on Earth be calculated based on the preservation of impact craters seen on the Moon? Taking into account the difference in gravity and ...
11
votes
2
answers
537
views
Why is the Earth's center still hot after millions of years? [closed]
Why didn't the center of the earth cool after millions or billions of years? What keeps it hot?
- 221
12
votes
3
answers
7k
views
Why isn't Earth a perfect sphere? [closed]
In general, almost everyone describes Earth as an perfect sphere, but in reality it isn't a perfect sphere.
Is there any specific reason why Earth is not perfect sphere ?
- 221