Humanities Flashcards
(144 cards)
Plate Tectonics
how old is earth
The Earth is estimated to be around 4.6 billion years old,
Plate Tectonics
3 features of Precambrian Era
land masses began to form
intense volcanic activity that released toxic gases into the atmosphere.
emergence of early life in the form of bacteria,
Plate Tectonics
when was the Palaeozoic Era
540 million – 250 million years ago
Plate Tectonics
4 features of Palaeozoic Era
formation of Pangea
Cambrian explosion
emergence of land plants, insects, and reptiles.
Permian extinction
Plate Tectonics
when was the Mesozoic Era
250 million – 65 million years ago
Plate Tectonics
3 features of Mesozoic Era
dominance of reptiles
Pangaea broke apart
mass extinction caused by an asteroid
Plate Tectonics
when was the Cenozoic Era
65 million years ago – Present
Plate Tectonics
4 features of Cenozoic Era
the rise of mammals, birds, and flowering plants.
The Earth’s climate cooled and dried,
shaping the continents into their present forms.
The first humans appeared
Plate Tectonics
what are the 4 Era’s in chronology order
Precambrian Era
Palaeozoic Era
Mesozoic Era
Cenozoic Era
Plate Tectonics
what is the earths 4 layers called from outer to inner
Crust to Mantle to outer core to inner core
Plate Tectonics
what are the properties of the crust
(location)
(basic properties)
This is the outer skin of the Earth and it is very thin and brittle. It is broken into pieces.
Plate Tectonics
what are the properties of the Mantle
(location)
(length)
(material)
This layer is between the crust and the outer core. This is the thickest layer (2900-3000km). It is made up of hot molten rock.
Plate Tectonics
what are the properties of the outer core
(material)
(product)
This layer is made of liquid iron nickel and creates Earth’s magnetic field as it spins.
Plate Tectonics
what are the properties of the inner core
(location)
(material)
(temperature)
This is the central layer of Earth’s structure and is made up of solid iron nickel. It is the hottest layer at 5500 degrees C.
Plate Tectonics
name the 3 main people that observed the plate tectonics theory in order
1st Alexander von Humboldt
2nd Alfred Wegener
3rd Harry Hess
Plate Tectonics
what was Alexander von Humboldt’s contribution to the plate tectonics theory
Noticed how the coastlines of South America and Africa seemed to fit together like puzzle pieces.
Suggested that Earth’s continents might have once been connected.
Plate Tectonics
what was Alfred Wegener’s contribution to the plate tectonics theory (what evidence did he provide)
stated the theory of continental drift, and that all continents were once joined in a supercontinent called Pangaea
(evidence)
Fossils: Similar fossils found on continents separated by oceans.
Geological Features: Mountain ranges on different continents lining up.
Climate Evidence: Fossils of tropical plants found in Antarctica.
Plate Tectonics
what was Harry Hess’s contribution to the plate tectonics theory
proposed the hypothesis of seafloor spreading.
Plate Tectonics
what were the past 4 super continents in chronological order
1 Nuna
2 Rodinia
3 Gondwana
4 Pangea
Plate Tectonics
formation of Nuna
Formation: 1.8 billion years ago
Plate Tectonics
formation of Rodina
Formation: 1.1 billion to 750 million years ago
Plate Tectonics
formation and time period of Gondwana
Formation: 550 million years ago
Time Period: Late Precambrian Era
Plate Tectonics
formation and time period of Pangea
Formation: 335 million years ago
Time Period: Late Paleozoic & Mesozoic Era
Plate Tectonics
name a possible future super continent
Pangea Ultima
Aurica
Novopangea
Amasia