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Flashcards in Ocean Origin Deck (13):
1

How long ago did the 'big bang' occur

13.7 billion years

2

What are the most abundant elements in the universe

Hydrogen and helium

3

How are heavier elements are produced

Nucleosynthesis

4

How do stars create helium

burn hydrogen making lots of energy- 4 hydrogen atoms and 5 million degree temp= 1 helium

5

What happens when all the hydrogen is gone

star collapses and will burn helium to form carbon and oxygen

6

How are the heaviest elements formed

from stars collapsing several times and supernovas

7

When was our solar system formed

4.6 billion years ago

8

Name some elements that remained when Earth formed

Oxygen (bonded to metals)
silicon
iron
aluminum
calcium
magnesium
sodium
potassium

9

How were the oceans formed

-volatile gases were trapped in Earth
-these were released in early history
-HCl made up sea salt
-volcanoes release additional volatiles

10

How old are the oceans

4 billions years

11

How did ocean become salty

volatile chemicals released by volcanoes
chemicals leached from rocks and crust

12

How has composition of sea changed

it hasn't for about 1 billion years

13

how has change in composition been attributed by living things

oxygen from cyanobacteria and plans
carbon from respiration and it accumulates in ocean sediment