Origin of earth - big bang hypothesis, PL-SQL Programming

Assignment Help:

ORIGIN OF EARTH -

BIG-BANG HYPOTHESIS -

  • Origin of life is linked to origin of earth.
  • Cosmos, the Universe originated 10-20 billion years ago by Big Bang (thermonuclear explosion).
  • Its part, a galaxy, (e.g., our Milky Way) comprises millions of stars, (our Sun is one of those).
  • Sun, its planets and satellite constitute the solar system.
  • Our earth is the 3rd planet with rocks, water & atmosphere.
  • It began as gaseous clouds of metals and non-metal atoms, later condensed to form surface rocks and boiling fluid core with gaseous atmosphere.

Chronology of events

Origin

Ago (Billion yrs)

Universe

10-20

Solar system

4.6

Earth

4.5

Oldest surviving rock

4.3

Life (Heterotrophs)

4.2-3.9

Old rock

3.9

Chemosynthetic

procaryotes

 

3.8-3.5

Oldest microfossils

(Cyanobacteria)

 

3.3-3.5

Photosynthetic procaryotes

 

3.5-3.3

Eukaryotes

1.6-1.5

NEBULAR HYPOTHESIS -

  • Earth is formed by gradual condensation of interstellar dust, from which our entire solar system is presumed to be formed.

Related Discussions:- Origin of earth - big bang hypothesis

Package dbms pipe in pl/sql, DBMS_PIPE: The Package DBMS_PIPE allows va...

DBMS_PIPE: The Package DBMS_PIPE allows various sessions to communicate over the named pipes. (A pipe is a region of memory used by one of the process to pass information to

Exception handling, set serveroutput on declare a number(5); b n...

set serveroutput on declare a number(5); b number(5); c number(5); begin a:=&a; b:=&b; c:=a/b; dbms_output.put_line(c); exception when zero_d

program for employees -ado.net framework , Challenge 1 You are require...

Challenge 1 You are required to do the project and write a test plan for it. Demo 4 is a check writer program for employees. In it, the user enters all information about the

Parameter & keyword description-execute immediate statement, Parameter and ...

Parameter and Keyword Description: dynamic_string: This is a string variable, literal, or expression which represents a SQL statement or the PL/SQL block. define_vari

Enforce security in the database system, Question: (a) In the context o...

Question: (a) In the context of database security explain how the following database features help to enforce security in the database system: (i) Authorisation (ii) Access

Tautology - equivalences rules, Tautology - Equivalences Rules: If the...

Tautology - Equivalences Rules: If there Tautologies are not all the time as much easy to note as the one above so than we can use these truth tables to be definite that a sta

Logical connectives - sql, Logical Connectives - SQL SQL's extended t...

Logical Connectives - SQL SQL's extended truth tables in which the symbol, for unknown, appears along with the usual T and F. Negation (NOT, ¬) Conjunction (

Organic evolution, Organi c Evolution Evolution is a slow continuou...

Organi c Evolution Evolution is a slow continuous, irreversible and natural process of change to give rise to advance and diverse forms of life i.e. formation of new specie

Type versus representation confusion in sql, Type versus Representation Con...

Type versus Representation Confusion in SQL This describes how a value might have two or more distinct representations. For example, user-defined type POINT might have a decla

Update stock levels, At times, customers make mistakes in submitting their ...

At times, customers make mistakes in submitting their orders and call to cancel the order. Brewbean's wants to create a trigger that automatically updates the stock level of all pr

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd