Earth was initially molten due to extreme volcanism and frequent collisions with other bodies. Eventually, the outer layer of the planet cooled to form a solid crust when water began accumulating in the atmosphere. The Moon formed soon afterwards, possibly as the result of a Mars-sized object with about 10% of the Earth's mass impacting the planet in a glancing blow. Some of this object's mass merged with the Earth, significantly altering its internal composition, and a portion was ejected into space. Some of the material survived to form an orbiting moon. Outgassing and volcanic activity produced the primordial atmosphere. Condensing water vapor, augmented by ice delivered from comets, produced the oceans. 

Earth was initially molten due to extreme volcanism and frequent collisions with other bodies. Eventually, the outer layer of the planet cooled to form a solid crust when water began accumulating in the atmosphere. The Moon formed soon afterwards, possibly as the result of a Mars-sized object with about 10% of the Earth's mass impacting the planet in a glancing blow. Some of this object's mass merged with the Earth, significantly altering its internal composition, and a portion was ejected into space. Some of the material survived to form an orbiting moon. Outgassing and volcanic activity produced the primordial atmosphere. Condensing water vapor, augmented by ice delivered from comets, produced the oceans.
Was Earth always solid?
Why not?
Any other reason?
Did the collisions occur frequently?
What formed on the outside?
Did the Moon form before or after the crust?
What became plentiful in the atmosphere?
What caused the Moon to be created?
What size object?
Did some of the object stay on Earth?
Where did the rest go?
What are the seas made of?
Anything else?
How many things created the atmosphere?
What was one?
And the other?
How big was the object that hit the Earth?
Did it hit directly
Did the collision affect Earth?
How?
no
Earth was initially molten
extreme volcanism
Earth was initially molten due to extreme volcanism 
collisions with other bodies.
Earth was initially molten due to extreme volcanism and frequent collisions with other bodies.
fno
frequent collisions with other bodies.
a solid crust
Eventually, the outer layer of the planet cooled to form a solid crust
after
The Moon formed soon afterwards, 
water
water began accumulating in the atmosphere. T
The Earth was hit by an object
 possibly as the result of a Mars-sized object with about 10% of the Earth's mass impacting the planet in a glancing blow
the size of Mars
possibly as the result of a Mars-sized object 
yes
Some of this object's mass merged with the Earth, 
into space
and a portion was ejected into space. 
water vapor
Condensing water vapor, augmented by ice delivered from comets, produced the oceans. 
comet ice
Condensing water vapor, augmented by ice delivered from comets, produced the oceans. 
two
Outgassing and volcanic activity produced the primordial atmosphere. 
Outgassing
 Outgassing and volcanic activity produced the primordial atmosphere. 
volcanic activity
Outgassing and volcanic activity produced the primordial atmosphere
10% of the Earth's mass
a Mars-sized object with about 10% of the Earth's mass
ino
impacting the planet in a glancing blow
yes
Some of this object's mass merged with the Earth, significantly altering its internal composition,
it altered its internal composition
 significantly altering its internal composition, 