What did rosalind franklin do for the discovery of dna?
finding that dna was nucleic acid made up of a long chain of individual nucleotides. producing images of dna molecules using x-rays.
figuring out that dna strands form a double helix.
conducting experiments that showed which nucleotides are complementary.

weathering - colorado river carves land in arizona to form the grand canyon. cracks form in a sandstone wall surrounding a house. a marble statue near the science museum is changing color due to rainfall

erosion - after a rainstorm, soil and rock piees litter the roadways. the sand dunes in the sahara desert are changing shape.

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