- What three things does the theory of plate tectonics explain?
- What is the evidence for Pangaea?
- How did Pangea seperate?
- What are the 4 pieces of evidence for plate tectonics?
- What are the two pieces of evidence for plate tectonics?
- What are 5 pieces of evidence that support continental drift?
- How many tectonic plates are there?
- What is the theory of plate tectonics Class 9?
- Why do tectonic plates move?
- Which part of Pangea broke apart first?
- What evidence supports the theory of plate tectonics quizlet?
What three things does the theory of plate tectonics explain?
Plate Tectonics Theory Plates are made of lithosphere topped with oceanic and/or continental crust.
The plates are moved around on Earth’s surface by seafloor spreading.
Convection in the mantle drives seafloor spreading.
Oceanic crust is created at mid-ocean ridges..
What is the evidence for Pangaea?
Evidence of existence Fossil evidence for Pangaea includes the presence of similar and identical species on continents that are now great distances apart.
How did Pangea seperate?
Scientists believe that Pangea broke apart for the same reason that the plates are moving today. The movement is caused by the convection currents that roll over in the upper zone of the mantle. This movement in the mantle causes the plates to move slowly across the surface of the Earth.
What are the 4 pieces of evidence for plate tectonics?
There is variety of evidence that supports the claims that plate tectonics accounts for (1) the distribution of fossils on different continents, (2) the occurrence of earthquakes, and (3) continental and ocean floor features including mountains, volcanoes, faults, and trenches.
What are the two pieces of evidence for plate tectonics?
Evidence from fossils, glaciers, and complementary coastlines helps reveal how the plates once fit together. Fossils tell us when and where plants and animals once existed. Some life “rode” on diverging plates, became isolated, and evolved into new species.
What are 5 pieces of evidence that support continental drift?
In the early part of the 20th century, scientists began to put together evidence that the continents could move around on Earth’s surface. The evidence for continental drift included the fit of the continents; the distribution of ancient fossils, rocks, and mountain ranges; and the locations of ancient climatic zones.
How many tectonic plates are there?
sevenThere are major, minor and micro tectonic plates. There are seven major plates: African, Antarctic, Eurasian, Indo-Australian, North American, Pacific and South American. The Hawaiian Islands were created by the Pacific Plate, which is the world’s largest plate at 39,768,522 square miles.
What is the theory of plate tectonics Class 9?
Plate tectonics is the theory that Earth’s outer shell is divided into several plates that glide over the mantle, the rocky inner layer above the core. The plates act like a hard and rigid shell compared to Earth’s mantle. This strong outer layer is called the lithosphere.
Why do tectonic plates move?
The plates can be thought of like pieces of a cracked shell that rest on the hot, molten rock of Earth’s mantle and fit snugly against one another. The heat from radioactive processes within the planet’s interior causes the plates to move, sometimes toward and sometimes away from each other.
Which part of Pangea broke apart first?
About 200 million years ago, the supercontinent began to break up. Gondwana (what is now Africa, South America, Antarctica, India and Australia) first split from Laurasia (Eurasia and North America). Then about 150 million years ago, Gondwana broke up.
What evidence supports the theory of plate tectonics quizlet?
Earthquakes and volcanic activity are also evidence of plate tectonics. Divergent and convergent boundaries are both prone to frequent volcanic activity. Does the lava in volcanoes come straight from Earth’s core? Earth’s core is made of solid iron, not lava, so magma can come directly from the core.