Who proposed the continental drift theory?

Who proposed the continental drift theory?

Alfred Wegener

Why does Antarctica not have a flag?

This continent is a condominium and therefore governed by different sovereign powers who agreed as per the Antarctica Treaty System to share the area and together utilize it without any border demarcation that form national zones. States party to this treaty share facilities and put up their flags next to each other’s.

Is AK 74 better than ak47?

Cartridge. The 5.45x39mm cartridge of the AK-74 makes it a more accurate and reliable rifle compared to the AK-47, which uses a 7.62x39mm cartridge.

What discovery about the ocean floor is associated with seafloor spreading?

The discovery of such magnetic stripes provided powerful evidence that sea-floor spreading occurs. The age of the sea-floor also supports sea-floor spreading.

What is continental drift and seafloor spreading?

Supporters of continental drift originally theorized that the continents moved (drifted) through unmoving oceans. Seafloor spreading proves that the ocean itself is a site of tectonic activity. Keeping Earth in Shape. Seafloor spreading is just one part of plate tectonics. Subduction is another.

Why is seafloor spreading important to continental drift?

Significance. Seafloor spreading helps explain continental drift in the theory of plate tectonics. When oceanic plates diverge, tensional stress causes fractures to occur in the lithosphere. Older rocks will be found farther away from the spreading zone while younger rocks will be found nearer to the spreading zone.

What don’t we know about plate tectonics?

“We don’t really know when plate tectonics as it looks today got started, but we do know that we have continental crust that was likely scraped off a down-going slab [a tectonic plate in a subduction zone] that is 3.8 billion years old,” Van der Elst said.

What are three good things that plate tectonics provide for humans?

Three good things that plate tectonics provide for humans are: fertile soils, ore deposits and fossil fuels.

What are the three major types of fault boundaries?

Tectonic Plates and Plate Boundaries

  • There are three main types of plate boundaries:
  • Convergent boundaries: where two plates are colliding.
  • Divergent boundaries – where two plates are moving apart.
  • Transform boundaries – where plates slide passed each other.

When two plates slide past each other what is it called?

When oceanic or continental plates slide past each other in opposite directions, or move in the same direction but at different speeds, a transform fault boundary is formed. No new crust is created or subducted, and no volcanoes form, but earthquakes occur along the fault.