Geoscience Exam 1 PSU || All Questions Answered Correctly.
0 view 0 purchase
Course
Geoscience 1 PSU ||
Institution
Geoscience 1 PSU ||
What are the key aspects of scientific thinking? correct answers Empiricism (data and observations)
Rationalism (logical reasoning)
Skepticism (question everything)
What is the difference between a hypothesis and a theory? correct answers Hypothesis: proposed relationship about the world that ...
Geoscience Exam 1 PSU || All Questions Answered Correctly.
What are the key aspects of scientific thinking? correct answers Empiricism (data and
observations)
Rationalism (logical reasoning)
Skepticism (question everything)
What is the difference between a hypothesis and a theory? correct answers Hypothesis: proposed
relationship about the world that can be TESTED and VERIFIED/DISPROVED by additional
data and experiments
Theory: statement that explains observations (if a hypothesis consistently is shown to explain
observations, it becomes a theory
How are data, observations and experiments used in science? correct answers Science is iterative
- back and forth from hypothesis, to data, to experiments, to new hypothesis, and on and on
When did the Big Bang occur? correct answers 13.7 billion years ago
What happened during the Big Bang? correct answers the hypothetical event that started the
expansion of the universe from a geometric point; the beginning of time
What elements were created during the Big Bang, during solar fusion, and during supernova
explosions? What is the relative abundance of these elements in the Universe? correct answers
Big Bang: Hydrogen and Helium
Solar Fusion: Elements as heavy as Iron
Supernova Explosions: Gold, Mercury, Uranium
Relative abundance of these elements cable of making planets, oceans, life, etc.
Lifecycle of Stars correct answers 1. Start out as nebulae, diffuse clouds of dust and gas
2. Nebulae collapse under gravity (gravitational potential energy --> kinetic/thermal energy)
3. Collapse leads to high temperatures (and pressure) --> nuclear fusion (elements melded
together to make bigger, heavier elements from lighter ones)
4. Nuclear fusion releases loads of energy --> balances out gravitational collapse and encourages
more fusion (star is no longer shrinking from gravitational collapse; quasi-stable)
5. H gets covered into elements as heavy as Carbon or Oxygen (for our sun; up to Iron for
smaller stars)
6. Once there's enough heavy stuff around, it becomes more difficult to "fuse" elements together,
so fusion slows and star collapses under gravity
7. With continued collapse, remaining energy of sun is so concentrated that it leads to a
supernova explosion
8. Supernovas have enough energy to smash even heavier stuff together and make elements like
Gold (Au), Mercury (Hg), and Uranium (U), etc.
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller FullyFocus. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $10.19. You're not tied to anything after your purchase.
