1. what are three forms of evidence that wegner used to support his idea of continental drift and which interested him the most?
2. what is the difference between continental drift and plate tectonics, and which is accepted as fact by the scientific community?
3. which layer of the earth makes up the tectonic plates?
4. what is continental crust and ocean crust composed of?
5. think about the types of instruments that a marine scientist or geologist might use to gather evidence to support the theory of plate tectonics. what specific instruments were needed to gather each of the following types of data? (use the "developing the theory" section)
(a) demonstration of the ruggedness and youth of the ocean floor
(b) confirmation of repeated reversals of the earth's magnetic field in the geologic past
(c) emergence of the seafloor-spreading hypothesis and associated recycling of oceanic crust
(d) precise documentation that the world's earthquake and volcanic activity is concentrated along oceanic trenches and submarine mountain ranges
6. how are ocean trenches formed?
7. where is earth's next ocean likely to form?
8. how does the formation of the hawaiian island chain differ from island chains along the ring of fire? explain your answer.
9. using the following site about the formation of the hawaiian islands, put the following islands in order from the oldest to the youngest.
• laysan island
• kure atoll
• la perouse pinnacle
• midway islands

1.-ancient climate clues that showed continents had once been in different locations  

-the same rock layers and fossils appeared on two widely separated continents

-One was that the continents fit together so well if you squeezed them bank together. You can see it on any globe. The parts fit like a puzzle.

1.Fossils

2.studies of ancient Climate

3.Geology of continents

2.The difference between continental drift and plate tectonics is that the theory of continental drift states that the world was made up of a single continent.The theory of plate-tectonics, on the other hand, states that earth's surface is broken into numbers of shifting plates or slabs.

3.The tectonic plates are made up of Earth's crust and the upper part of the mantle layer underneath. Together the crust and upper mantle are called the lithosphere and they extend about 80 km deep.May 21, 2008

4.The continental crust is the layer of granitic, sedimentary and metamorphic rocks which form the continents and the areas of shallow seabed close to their shores, known as continental shelves. It is less dense than the material of the Earth's mantle and thus "floats" on top of it.

5.(a) demonstration of the ruggedness and youth of the ocean floorecho-sounding devices and primitive sonar systems(b) confirmation of repeated reversals of the Earth's magnetic field in the geologic pastmagnetic instruments (magnetometers)(c) emergence of the seafloor-spreading hypothesis and associated recycling of oceanic crustdrilling core samples at specific locations(d) precise documentation that the world's earthquake and volcanic activity is concentratedalong oceanic trenches and submarine mountain ranges earthquake-recording instruments called seismograph)

6.Trenches are formed by subduction, a geophysical process in which two or more of Earth's tectonic plates converge and the older, denser plate is pushed beneath the lighter plate and deep into the mantle, causing the seafloor and outermost crust (the lithosphere) to bend and form a steep, V-shaped depression.

7.Red Sea

8. Hawaii sits on a hot spot, not the edge of a tectonic plate like other island chains..the movement of the plate caused and continues to cause the Hawaiian chain

9. Youngest - La Perouse Pinnacle (part of French Frigate      Shoals)  

 Older - Laysan  

 Older - Midway  

 Oldest - Kure Atoll

the answer is 1. photosynthesis. glad to