It was constantly bombarded by massive
rocks and other materials from the space.
In this way, the size of the Earth grew.
Answers
Answer:
Air raid shelters, also known as bomb shelters, are structures for the protection of non-combatants as well as combatants against enemy attacks from the air. They are similar to bunkers in many regards, although they are not designed to defend against ground attack (but many have been used as defensive structures in such situations).[citation needed]
Answer:
Early Earth suffered constant threat of attack from leftover planet-building material. From about 4.5 to 3.8 billion years ago, failed planets and smaller asteroids slammed into larger worlds, scarring their surface. Near the end of the violence, during a period known as the Late Heavy Bombardment, impacts in the solar system may have increased. The increased activity most likely came from the movement of the giant planets, which sent debris raining down on the smaller rocky worlds.
Scars and signs
Earth bears relatively few scars from its violent youth because weathering and plate tectonics have renewed its surface. But the three other rocky planets (Mercury, Venus and Mars), as well as the moon, still carry the signs of the increased collisions.
By using crater counting methods to estimate ages on these scarred worlds, scientists have been able to estimate time frames for material slamming into their surface. Samples collected by Apollo moonwalkers also contain the chemical signatures from different meteorites. Together, the evidence indicates that impacts increased about 3.8 to 3.9 billion years ago, during the Late Heavy Bombardment, which is thought to have lasted between 20 million to 200 million years.
Even the asteroid belt may show some wear and tear, with traces of chemicals that bind tightly to iron found on their surface rather than beneath it. In addition to finding that the asteroids took longer to accrete than previously suspected, recent research revealed that "there also must have been lots of small or medium-sized bodies present in the solar system for these collisions to have occurred over a range of time scales," Christopher Dale, a researcher at England's Durham University, told Space.com previously.
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