Answer
Geometric with a common ratio of $0.1$.
Work Step by Step
Check if there is a common ratio by diving each pair of consecutive terms:
$\dfrac{0.7}{7}$ $=0.1$;
$\dfrac{0.07}{0.7}$ $=0.1$ ;
$\dfrac{0.007}{0.07}$ $=0.1$.
The ratio is constant so the sequence is geometric.
The common ratio is $0.1$.