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

Long and long raw in pl/sql, LONG and LONG RAW You use the LONG datatyp...

LONG and LONG RAW You use the LONG datatype to store the variable-length character strings. The LONG datatype is such as the VARCHAR2 datatype, except that the maximum length o

How exceptions propagate in pl/sql programming?, How Exceptions Propagate ?...

How Exceptions Propagate ? Whenever an exception is raised, and if the PL/SQL cannot find a handler for it in the present subprogram or block, the exception propagates. That is

Need to change mysql query to pdo, Need to change mysql query to PDO Pro...

Need to change mysql query to PDO Project Description: I want someone to convert me 1 .php file that includes some sql/mysql stuff to PDO is a very small file. Skills requ

Advantages of packages, Advantages of Packages The benefits of the Pack...

Advantages of Packages The benefits of the Packages are as shown below: Modularity The Packages encapsulate logically associated items, types, and subprograms in the

Variable declaration - sql, Variable Declaration - SQL SQL's support f...

Variable Declaration - SQL SQL's support for variables is very similar to Tutorial D's, except that the syntax for creating persistent variables-base tables-is quite differen

Insert command in sql, INSERT Command in SQL Loosely speaking, INSERT...

INSERT Command in SQL Loosely speaking, INSERT takes the rows of a given source table and adds them to the specified target table, retaining all the existing rows in the targ

Bulk fetching - bulk bind performance improvement, Bulk Fetching The i...

Bulk Fetching The illustration below shows that you can bulk-fetch from a cursor into one or more collections: DECLARE TYPE NameTab IS TABLE OF emp.ename%TYPE; TYPE S

Boolean values-assignments in pl/sql, Boolean Values Only the values TRU...

Boolean Values Only the values TRUE, FALSE, & NULL can be assigned to a Boolean variable. For illustration, given the declaration DECLARE done BOOLEAN; the following statements

Seeking a programmer to design a legal document, Seeking a programmer to de...

Seeking a programmer to design a legal document with pre-existing fields that could allow the auto-population of client(s) information (i.e. Name, Account Number, Address etc.) int

Example of shorthand for a row constraint - sql, Example of Shorthand for a...

Example of Shorthand for a row constraint Example: Shorthand for a row constraint ALTER TABLE EXAM_MARK ADD CONSTRAINT Mark_in_range CHECK (Mark BETWEEN 0 AND 100);

Write Your Message!

Name

Email id

Message

Verfication Code

User Account

All Pages