Explanation:
The initial time is t₁ = 2:30 pm
The final time is t₂ = 2:30:45
We must analyze the students' motion concerning time. The final time exceeds the initial time by 45 seconds.
Change in time,

Therefore, this is the solution we need.
Answer:
Cooling can lead to the solidification of magma within the Earth, resulting in the creation of igneous rocks
Explanation:
Magma is composed of molten or semi-molten materials formed in the mantle which ascends due to convective currents within the Earth. As magma rises, it encounters lower temperatures and consequently cools, resulting in solidification. The rocks produced by this process are referred to as igneous rocks. There are over 700 varieties of igneous rocks found beneath the Earth's surface, and they, along with metamorphic rocks, constitute up to 90% of the total rock types within 10-15 km from the surface.