WorksheetsEarth's Formation
Total questions: 23
Worksheet time: 18mins
How old is the Earth?
4.5 billion years
Match the following
A
planetesimal
B
Protoplanet
C
Planet
Match the following
Gravity causes the solar nebula to collapse
The protosun forms at the center of the nebular disk
Planetesimals form through accretion
Protoplanets form
Constant bombardment causes Earth to become molten
Match the following
Planetesimals form through accretion
Protoplanets form
Constant bombardment causes Earth to become molten
Chemical differentiation occurs
The Earth cools
How did the Earth get its water?
much of it was trapped inside the Earth as it formed and released as the Earth cooled
much of it was delivered to Earth through the impact of comets and other icy bodies
much of it was pulled from the moon's surface when the moon was much closer
early cyanobacteria produced it as a by product of photosynthesis
much of it was trapped in the form of glaciers and was released as the Earth warmed
Which 2 gases made up the majority of Earth's atmosphere when it first formed?
carbon dioxide
oxygen
ozone
water vapor
ammonia
The waste gas released by plants as they synthesize food sugars (photosynthesis) from carbon dioxide and water is ________.
oxygen
methane
nitrogen
carbon dioxide
The graph below represents the change of two atmospheric gases over Earth's history. Which gas does the red line represent?
carbon dioxide
oxygen
nitrogen
argon
Ammonia
The graph below represents the change of two atmospheric gases over Earth's history. Which gas does the blue line represent?
carbon dioxide
oxygen
nitrogen
argon
Ammonia
In the early history of Earth, the solid surface of the earth weathered more rapidly than now because ________.
the early rain was very acidic
the rocks at the surface were weak because there was little oxygen available
the atmosphere contained large amounts of corrosive methane
there was little topography so shallow water washed across the surface often
there were numerous earthquakes and volcanoes breaking up the surface
Which of these is a major reason that oceans are salty?
Many of the objects that bombarded the early Earth were full of salty minerals
The weathering of rocks on the continents produced salt that was washed into the oceans
The Earth's early crust was full of salts and other sediments that leeched into the oceans
They're always getting picked on by the continents
The process of outgassing is responsible for the formation of the:
Early atmosphere on Earth
The first land masses on Earth
The first complex life on Earth
The first hurricanes on Earth
The first elements on Earth
The Earth formed from gas and dust in space, known as a:
Solar nebula
Black hole
Main sequence star
Wormhole
Galaxy
The process of rocky material growing in size due to repeated collisions with other space debris is called:
Subtraction
The earliest organisms that converted sunlight and carbon dioxide into oxygen were:
Insects
The Earth's early atmosphere decreased in carbon dioxide and increased in oxygen due to:
Reorder the following
Reorder the following
Reorder the following
Gravity causes the solar nebula to collapse
The protosun forms at the center of the nebular disk
Planetesimals form through accretion
Protoplanets form
Constant bombardment causes Earth to become molten
The early oceans on Earth became salty due to:
Weathering of minerals and salts from Earth's crust
The early atmosphere on Earth formed from a process known as:
Outgassing occurs on Earth today and is known as:
Which of the following are responsible for increasing the amount of salt in the early oceans on Earth?
Hydrothermal vents
Weathering and erosion of rocks and minerals
Evaporation of large quantities of water
Photosynthetic bacteria
Clouds in the atmosphere dropped salt
