A cloud collapses to form a star and disk. Planets form from this disk. According to our current understanding, a star and its planets form out of a collapsing cloud of dust and gas within a larger cloud called a nebula.
The Earth is thought to have been formed about 4.6 billion years ago by collisions in the giant disc-shaped cloud of material that also formed the Sun. Gravity slowly gathered this gas and dust together into clumps that became asteroids and small early planets called planetesimals.
breaking of rocks due to constant expansion and contraction involves mechanical stresses from expanding n contracting. so ans is A. mechanical weathering
Answer:
Both explain how the movement of the Earth's crust occurs.
Answer:
Explanation:
perimeter of rectangle=2(l+w)
=2(4/3+15/4)
=2(4*4+15*3/12)
=2(16+45/12)
=2(61/12)
=122/12 cm
area of rectangle=l*w
=4/3*15/4
=60/12
=5 cm^2
