Question
Drag and drop the words or phrases that accurately complete the summary.
The Earth formed approximately
billion years ago. The early Earth had a
environment. Volcanic activity spewed toxic gases such as
and hydrogen sulfide. Temperatures were high as meteorites and asteroids bombarded the surface with numerous
which lessened about
billion years ago. Many scientists believe that once collisions were reduced, then life forms may have originated around
billion years ago. This evidence was found in fossilized
which were formed by layers of
also called blue-green algae. These first life forms were
microbes that used carbon dioxide, water, and sunlight to produce food and
. It took millions of years for Earth's atmosphere to build up oxygen, and primitive primordial soup became the
. As the lava cooled and hardened, both oceanic and continental
formed.
cyanobacteria
3.5
photosynthetic
stromatolites
crust
oxygen
methane
3.8
4.6
hostile
explosions
oceans
The Earth formed approximately
billion years ago. The early Earth had a
environment. Volcanic activity spewed toxic gases such as
and hydrogen sulfide. Temperatures were high as meteorites and asteroids bombarded the surface with numerous
which lessened about
billion years ago. Many scientists believe that once collisions were reduced, then life forms may have originated around
billion years ago. This evidence was found in fossilized
which were formed by layers of
also called blue-green algae. These first life forms were
microbes that used carbon dioxide, water, and sunlight to produce food and
. It took millions of years for Earth's atmosphere to build up oxygen, and primitive primordial soup became the
. As the lava cooled and hardened, both oceanic and continental
formed.
cyanobacteria
3.5
photosynthetic
stromatolites
crust
oxygen
methane
3.8
4.6
hostile
explosions
oceans
Answers
GPT-4o mini
The Earth formed approximately **4.6** billion years ago. The early Earth had a **hostile** environment. Volcanic activity spewed toxic gases such as **methane** and hydrogen sulfide. Temperatures were high as meteorites and asteroids bombarded the surface with numerous **explosions** which lessened about **3.8** billion years ago. Many scientists believe that once collisions were reduced, then life forms may have originated around **3.5** billion years ago. This evidence was found in fossilized **stromatolites** which were formed by layers of **cyanobacteria**, also called blue-green algae. These first life forms were **photosynthetic** microbes that used carbon dioxide, water, and sunlight to produce food and **oxygen**. It took millions of years for Earth's atmosphere to build up oxygen, and primitive primordial soup became the **oceans**. As the lava cooled and hardened, both oceanic and continental **crust** formed.