Which of the following is an example of sustainable use of natural resources?
a)continuously strip mining coal deposits in an area

b)clear-cutting a forest

c)harvesting huge populations of fish from a fishing shoal

d)planting multiple crops together on a field and harvesting them at different times

d)planting multiple crops together on a field and harvesting them at different times.

Explanation:

Sustainable use of natural resource can be define as the use of resource in a manner so that they remain available for present and future generation.

d)planting multiple crops together on a field and harvesting them at different times is the correct option this is because of the fact that if multiple crops are grown on the same field. This will lead to addition of minerals to the soil directly by the growth of plants or by symbiotic association of plant roots with the soil microbes. This will keep the soil in fertile state so that the future crops can be grown over it.

d concave shape of wave rock

explanation:

the concave shape of wave rock is a very good evidence that supports the evolution of earth due to chemical weathering. if we talk about structure of   wave rock, studies have estimated that it is around 2.7 billion years old. it also serves as the foundation of evidence that it was the place where australian continent began to form.

how the structure of wave rock was created?

studies suggest that structure of wave rock was created when the surrounded area was started to weather due to which deposition of material started on the part of land which now contains wave rock.

the structure of wave rock is considered to be one of the best-known landforms in australia. at the height of around 15 cm, there can be found flared slopes which formulate the margins of hyden rock. it is now assumed by geologists that wave rock was created by subsurface water-induced weathering and not by glaciers, waves or wind.

due to deposition of material over the period of long time, the wave rock became tougher and tougher due to weathering from surrounding terrain. this makes it a physical evidence that supports   the evolution of earth due to chemical weathering.

hope it !