Answer: Australia and Japan
Explanation:
The topography of the seafloor gives us a nice clue about the seafloor spreading. This can be seen in the highest of the underwater features. The mid-ocean ridge is the highest. It is the place where the magma comes out, cools off, and constantly creates new rocks, or rather crust. As we move further away from the mid-ocean ridge, we will notice that the sea mounds are getting smaller and smaller, but also more rounded, or flatter. This is an evidence of the erosion by the water. As the water erodes the crust, it loses on height, thus becomes less pointy, and more rounded or flatter. As we move even further away we will see that there's no more sea mounds, but it is only the old crust that is predominantly flat, which of course has been caused by the millions of years of erosion by the water. This was actually the first thing that has been noticed and that gave a clue to the scientists that maybe the seafloor is spreading, and with the further examinations of it, it turned out to be true.
have, at one time, been covered by water?
(1) Volcanic eruptions contain large amounts of
water vapor.
(2) Coral reefs formed, in the past, along the
edges of many continents.
(3) Seafloor spreading has pulled landmasses
apart and pushed them together.
(4) Sedimentary bedrock of marine origin covers
large areas of Earth’s continents.
Statement 4, 'Sedimentary bedrock of marine origin covers large areas of Earth's continents' best supports the inference that most of Earth's present-day land surfaces have, at one time, been covered by water because these rocks are formed from the sediments gathered on the seafloor, indicating that the area they are found in was once underwater.
The statement that best supports the inference that most of Earth's present-day land surfaces have, at one time, been covered by water is '(4) Sedimentary bedrock of marine origin covers large areas of Earth's continents'. Here's why:
Sedimentary bedrock of marine origin, also known as marine sedimentary rocks, are often clear indicators that the area they are found in was at some point underwater. These rocks form as a result of the accumulation of sediments, such as sand, silt, and organic material, on the floor of oceans or seas. Over time, due to processes such as compaction and cementation, those sediments transform into rock. Therefore, wherever we find this type of rock, we can infer that this region was once submerged underwater.
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b. third
c. fourth
d. fifth
Answer:
The answer is B) third
Explanation:
B. cacti.
C. marsupials.
D. eucalyptus.
Answer:
All of us know that the earth is rotating continuously in its orbit. But we dont realize the rotation due to gravitational force. The earth rotates in its own axis this causes day and night . While rotating on its axis, earth also rotates around elliptical axis around the sun which causes the different regions to experience different seasons. The side facing the sun experience summer and other side experience winter.