Describe how continents move across the ocean basins as if they are on a conveyor belt.

1 answer:

7 0

The present continent positions are not the same as their ancient positions. For example, Africa and South America used to be together in the old Gondwanaland. Alfred Wegener noticed the correlation in complementary forms of the coast lines of these two continents and developed the theory of continental drift. But it wasn't until the late 1960's or early 1970's that the mechanism for this movement was discovered in the theory of plate tectonics. Actually, it was shown that the mid-oceanic ridges like the one going through Iceland is where molten rock is welling up from the mantle on a zone of fracturing and the convection currents from this cause the ocean spreading and thus the movement of continents away from each other as in the case of Africa and South America.

You might be interested in

What environmental changes affected the evolution of reptiles?

valentinak56 [21]

Earth went through a period of hot and also dry conditions and a wide spread drought.These conditions favored reptiles and therefore causing them to evolve during those conditions. Hope this helps :)

7 0

3 years ago

What is the significance of chitin in arthropods?

yKpoI14uk [10]

The significance of chitin in arthropods is Chitin is a structural carbohydrate that forms their exoskeleton.

5 0

3 years ago

The nose is an example of Nociceptor Sensory receptor Sensory organ

patriot [66]

Answer:

other guy is wrong its sensory organ

Explanation

4 0

3 years ago

Where do the most amount of energy in food webs come from ?

expeople1 [14]

Answer:

A. The Sun

Explanation:

The farther down the food web or food chain you go, the less energy is transferred from one organism to the next. This means that by one organism consuming the other, the one doing the consuming will receive less energy than the one that it had just consumed had from whatever it ate.

Because the sun is the basis on all energy, and producers get their energy from the sun, it carries the most amount of energy.

8 0

2 years ago

Read 2 more answers

Which describes a target cell? releases hormones into the blood produces a particular hormone recognizes a hormone’s chemical st

wlad13 [49]

Answer:

recognizes a hormone’s chemical structure

Explanation:

In living systems, chemical messengers called hormones are secreted into the body via the bloodstream or ducts by certain glands called endocrine glands e.g pancreas, hypothalamus etc. These hormones are meant to effect a physiological change in certain cells called TARGET CELLS.

In biology, a target cell is any receiving cell that has the ability to respond to signals and messengers like hormones. This responding ability of hormones is due to the possession of specific receptor sites for the specific hormones. The receptor on a particular target cell recognizes that specific hormone's chemical structure, hence, will only respond to it.

For example, an insulin hormone secreted by the pancreas will only be responded to by a target cell that recognizes the chemical structure of the insulin protein using its receptor molecule.

4 0

3 years ago