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...solid.’ But over time there was more and more evidence came together to show that actually they did. But it wasn’t until people found the mechanism by which that happened that that theory crystallised and became accepted fact. RICHARD HOLLIMAN Cool. So what would it take for that to change? What would it take for somebody to come and say, ‘Actually, we’ve...

...solid shapes – or three-dimensional (3D) shapes . Summary In this section you have learned: that area is the space inside a two-dimensional (2D) shape or space how to find the area of rectangles, triangles, trapeziums and compound shapes how to use the formula to find the area of a circle...Session 4: Shape and space: 3 Volume - The volume of a shape is how much space...

...solid was 0.000 002 456 84 metres. You could make the number more memorable by using two significant figure accuracy. Answer To find 0.000 002 456 84 metres correct to two significant figures, count from the first non-zero digit on the left. The first significant digit in this number is the 2. The zeros to the left of this digit are not significant but they maintain the...

...liquid form. It doesn't get locked away as ice during the winter. In other parts of the word there is a different mix and cycle of environmental variables. In temperate regions, where the seasons are more pronounced, production takes place in spring and summer, when there's the most sunlight and the warmest temperatures. This cycle of production through the seasons can...

...liquid. OK. This seemed obvious for a number of reasons. For example, when waves pass through a narrow gap in a barrier, they spread out somewhat to the side rather than going straight on, and that’s what light does. Put two gaps close together and the humps and troughs from the two gaps overlap and interfere with each other. This gives rise to directions where the...