Simple Answer:
If the Earth shrinks, the day gets shorter and the Earth rotates faster. But, that involves certain assumptions. See below.
Angular Momentum:
This is a question about angular momentum.
If the change in size of the Earth is a result of an internal process and no external forces are involved, then total angular momentum is conserved. Angular momentum is the sum (integral) of all mass times velocity times the distance from the axis of rotation. That sum will stay the same as you redistribute mass with no external influences. If mass gets closer to the axis of rotation, then some mass has to go faster.
The moment of inertia of a uniform sphere is I=2MR^2/5. Angular momentum is L=I omega. Omega is 2 pi/T and the period, T, is one day. So, L=2 pi I T. (The Earth is not uniform, but the result is the same.) If you keep M fixed and the density uniformly increases, then omega decreases. We can't get too precise without discussing more details, but the simple analysis suggests, T/R^2 is constant, so the period is proportional to square of the radius. Halve the radius and the day decreases to one fourth.
The duration of The Day Mars Invaded Earth is 1.17 hours.
Decreased vegetation on Earth could lead to negative impacts such as increased soil erosion, reduced carbon sequestration, loss of habitat for wildlife, and decreased biodiversity. This can have cascading effects on ecosystems and human well-being, including food security and climate regulation.
If the number of photosynthetic organisms on Earth decreased drastically, there would be a significant reduction in oxygen production, leading to decreased atmospheric oxygen levels. This would impact not only those organisms that rely directly on oxygen for survival but also disrupt food chains, as many organisms depend on photosynthetic species for energy. Additionally, increased carbon dioxide levels could contribute to climate change, further exacerbating ecological imbalances.
If Earth's tides decreased, the most likely explanation would be a significant reduction in the gravitational influence of the Moon, which is the primary driver of tides. This could occur if the Moon were to move further away from Earth or if its mass decreased. Additionally, changes in sea level due to climate factors or geological events could also affect the perceived strength of tides. However, such scenarios would require extraordinary circumstances, as the Moon's influence is stable over long periods.
There are many ways in which the Earth changes with time. The Earth will change shape and climates for example.
There is no evidence that it has decreased.
The duration of Earth Days is 1.7 hours.
The duration of Night on Earth is 2.15 hours.
The duration of The Man from Earth is 1.48 hours.
The duration of Another Earth is 1.53 hours.
The duration of Earth Trek is 1800.0 seconds.
The duration of Lost on Earth is 1380.0 seconds.
The duration of This Island Earth is 1.45 hours.
The duration of Morning of the Earth is 1.32 hours.
The duration of Kell on Earth is 2640.0 seconds.
The duration of Sunrise Earth is 3000.0 seconds.
The duration of Action Earth is 300.0 seconds.